Integrate a number of existing RPi.GPIO API examples and much more

changes in this patch:
	.coveragerc:
	- report coverage information on RPi/core.py instead
	  of RPi/_GPIO.py due to file name change

	Makefile:
	- %s/unit-cov/test-cov/g
	- removed an extraneous comment

	RPi/GPIO/__init__.py:
	RPi/GPIO_DEVEL/__init__.py:
	- Added header docstrings
	- formatted and sorted API imports

	RPi/_GPIO.py -> RPi/core.py:
	- File renamed to clarify purpose
	- convert header to docstring format
	- sort and organize functions and constants
	- fix documentation errors and gramatical mistakes
	- add automatic invokation of cleanup() at interpreter exit
	- add RPi.GPIO.{RPI_INFO, RPI_REVISION, VERSION} constants
	- fix various cases of mishandling of iterable channel and value
	  lists
	- fix pwm thread never releasing lock if thread dies due to
	  exception when the main thread revokes access, however I
	  suspect that this actually be a surface fix for another bug,
	  will look into further (#29)
	- small tweaks to improve modularity
	- add support for single value and iterable lists of values for
	  RPi.GPIO.cleanup()
	- allow PwM to successfully start without explicitly setting up
	  a channel as an output because this library has a more relaxed
	  attitude about those things
	- add warn on invalid call to PWM.start()
	- fix board numbering mode being actually pretty broken due to
	  inconsistent mishandling of channel inputs of various forms
	- fix line_get_value being actually very broken and not
	  retuning anything and therefore always returning None
	- fix gpio_function() being actually entirely broken so it
	  returns the current function representing what is going on on
	  a GPIO channel as RPi.GPIO would, but this requires further
	  testing (#30)
	- fix RPi.GPIO.PWM.start() not returning the truth of whether a
	  PwM thread has been successfully started or not

	examples/callback2.py:
	- add shabang

	examples/flash18.py:
	- remove debuginfo output toggle

	examples/input_examples.py:
	examples/output_examples.py:
	examples/pwm2.py:
	examples/pwm_usage.py:
	examples/random_usage.py:
	examples/try_import.py:
	- copy example code from Ben Croston's RPi.GPIO wiki on
	  sourceforge
	- see the files for the sources
	- ensure that the code works with this library. I found quite a
	  few bugs integrating these files
	- fix a few mistakes in the code
	- fix style

	examples/morse.py:
	- update morse code to current API version
	- add basic input validation
	- fix style

	examples/pwm.py:
	- renamed to pwm1.py for consistency

	examples/pwm1.py:
	- add try except structure
	- this may be revelvant to (#29)

	examples/pwm3.py:
	examples/pwm4.py:
	- Copy example code from some forum
	- see the files for the sources

	non_root_permission.sh:
	- expand note on lack of persistence of effects post reboot

	requirements.txt:
	- update with latest output of pip freeze from my virtualenv,
	  however this _may_ be bloat

	spec/spec.tex:
	- fix some typos
	- add entry for channel_valid_or_die
	- update some of the technical spec

	spec/spec.pdf:
	- regenerate document

	test-style.sh:
	- scan RPi/core.py instead of RPi/_GPIO.py due to name change
	- add scan of examples/morese.py since it is again working

	tests/test_gpio.py:
	- style tweaks
	- fix test_gpio_function by making it actually test for the
	  feature that now is possibly implemented correctly
	- modify test_setdebug info to turn it off before the next call
	  to Reset to avoid printing a lot of text to the terminal
	- extend test_cleanup to validate the new features of cleanup()

	tests/test_pwm.py:
	- more thoroughly test PWM.start()

Signed-off-by: Joel Savitz <[email protected]>

.coveragerc

@@ -1,2 +1,2 @@
 [report]
-include = RPi/_GPIO.py
+include = RPi/core.py

Makefile

@@ -1,9 +1,12 @@
+# Makefile to automate common testing procedures for python3-libgpiod-rpi
+# By Joel Savitz
+# This is free software, see LICENSE for details
+
 all: test
 
-test: unit-cov style
-#@echo "MAKE TEST PASS"
+test: test-cov style
 
-unit-cov:
+test-cov:
 	@bash test-cov.sh -m && echo "FUNTIONAL PASS" || echo "FAILURE IN UNIT TEST"
 
 style:

RPi/GPIO/__init__.py

@@ -1,7 +1,49 @@
-# The extended RPi.GPIO API
-from RPi._GPIO import setup, cleanup, output, input, setmode, getmode, add_event_detect, remove_event_detect, event_detected, \
-    add_event_callback, wait_for_edge, gpio_function, setwarnings, \
-    getbias, setbias, getdirection, setdirection, getactive_state, setactive_state, \
-    channel_valid_or_die, \
-    BCM, BOARD, UNKNOWN, IN, OUT, RISING, FALLING, BOTH, PUD_UP, PUD_DOWN, PUD_OFF, PUD_DISABLE, \
-    HIGH, LOW, PWM, I2C, SPI, HARD_PWM, SERIAL
+"""
+The RPi.GPIO API
+Originally created by Ben Croston
+Reimplemented and extended by Joel Savitz and Fabrizio D'Angelo
+This is free software, see LICENSE for details
+"""
+
+from RPi.core import\
+    BCM,\
+    BOARD,\
+    BOTH,\
+    FALLING,\
+    HARD_PWM,\
+    HIGH,\
+    I2C,\
+    IN,\
+    LOW,\
+    OUT,\
+    PUD_DISABLE,\
+    PUD_DOWN,\
+    PUD_OFF,\
+    PUD_UP,\
+    PWM,\
+    RISING,\
+    RPI_INFO,\
+    RPI_REVISION,\
+    SPI,\
+    UNKNOWN,\
+    VERSION,\
+    add_event_callback,\
+    add_event_detect,\
+    channel_valid_or_die,\
+    cleanup,\
+    event_detected, \
+    getactive_state,\
+    getbias,\
+    getdirection,\
+    getmode,\
+    gpio_function,\
+    input,\
+    output,\
+    remove_event_detect,\
+    setactive_state,\
+    setbias,\
+    setdirection,\
+    setmode,\
+    setup,\
+    setwarnings,\
+    wait_for_edge

RPi/GPIO_DEVEL/__init__.py

@@ -1,3 +1,21 @@
-# Development functions, not needed for normal use
-from RPi._GPIO import Reset, State_Access, setdebuginfo, is_all_ints, is_all_bools_or_directions,\
-    is_iterable, line_get_mode, line_set_mode, _line_mode_none, _line_mode_out, _line_mode_in
+"""
+The new RPi.GPIO_DEVEL development and debug API
+By Joel Savitz and Fabrizio D'Angelo
+This is free software, see LICENSE for details
+"""
+
+# We have added functions and constants to this list as we have seen
+# necesary but we are open to adding more if there is any interest
+
+from RPi.core import\
+    is_all_bools_or_directions,\
+    is_all_ints,\
+    is_iterable,\
+    Reset,\
+    setdebuginfo,\
+    State_Access,\
+    line_get_mode,\
+    line_set_mode,\
+    _line_mode_in,\
+    _line_mode_none,\
+    _line_mode_out