additional fixes for bioconda distribution

• flag glasgow-ext is no longer supported in OSX
• seems like BusyBox v1.36.1's readlink does not have a -m option

Fix debian dependencies and avoid gcc use at runtime

This release is "just" an update to fix minor issues with package distribution through Ubuntu Launchpad and bioconda.

Updated energy parameters to ViennaRNA 2.5.1

• underlying bellman's GAPc was updated such that
  • thermodynamic parameters where updated to be en par with ViennaRNA 2.5.1
  • mk_pf() and scale() repretitive computation is cached to speed up probability computations, thanks @fymue !

adapted energy parameter fix from ViennaRNA

• fixing a bug with latest gcc version regarding definition of openParen and closeParen pre-definitions leading to segfaults for whatever input. Thanks Vincent von Schelm for bringing this to my attention!
• raising a warning about potential errors in free energy computation when using macrostate and energy parameters that violate the assumption that dl_energy + dr_energy == ext_mismatch_energy (this was true for Turner1999, but is no longer in Turner2004). See: #26
• using a non deprecated method for number rounding, thus preventing multiple warnings to bug the user in front ends
• raising a warning about potentially wrong energy computation if a) in alignment mode and b) in window mode. See: jlab/gapc#79

stable release for bioconda

Merge pull request #7 from jlab/fix_stefanstyletests

Fix stefanstyletests