v2.0.3

Updated TODO list and minor fixes

Added test parameter description of gnu_coreutils.pwd().
Removed redundant '$' from regex in extra.list_dirs().

v2.0.2

Updated gnu_coreutils.pwd(), added its tests

Removed long_args parameter (sh gives error).
Added test parameter (as every other gnu_coreutils functions has it).
Therefore added 3 tests.

v2.0.1

Added type for test parameter in gnu_coreutils.cd()

Removed "short_args=" from its tests.

v2.0.0

Repositioned parameters in functions in gnu_coreutils module

Moved short_args and long_args closer to path parameters as they are
used more often than batch and sudo parameters. Hence decreased use
of keyword arguments (e.g., "short_args="). Hence improved readability.
Affected functions: cp(), ln(), ls(), mv(), rm().

v1.3.1

Fixed typo in description of core.Shell.get_lines()

v1.3.0

Added gnu_coreutils.pwd()

v1.2.0

Upgraded list_dirs() and list_files() in extra module

Added hidden and non_hidden parameters to expand functionality.

v1.1.0

Added list_dirs() and list_files() in extra module

v1.0.3

Fixed shell chaining

v1.0.2

Removed test for extra.force_sudo_password_promt()

It removes user's sudo timestamp which may be inconvenient.
Removed meaningless quantifier "{1}" from gnu_coreutils.cd().
Formatted comments in test files to impove consistency and readability.