section_system_description -> section_system
cell_associated -> cell_dependent

Broke the parsing of different CP2K run types into separate modules. The common functionality is now found in 'commonmatcher.py'. I think that this will make the code maintenance much easier than having everything in one huge file.

Added parsing for external force file, added detection of CP2K run mode and optimization based on it, started working on GEO_OPT parsing.

Added parsing of input file if found, added support for more functionals, corrected the formatting of functionals, restructured the package a bit.

Added parsing of input file if found, added support for more functionals, corrected the formatting of functionals, restructured the package a bit.