Update to newer CBMPy

[jonrkarr]

This package should be updated when the new version of CBMPy (~0.8.0) is completed. The version currently in PyPI is missing some algorithms such as pFBA that were in the earlier version and which the developers appear to be adding back.

The newer version depends on swiglpk rather than glpk. This will allow the installation to be simplified.

• Replace glpk in requirements.txt with swiglpk
• Remove Dockerfile run step that compiles the python glpk package
  • Remove the installation of libglpk-dev and gcc
  • Remove the compilation of the python glpk package