Matching sentences before returning result.

Those items that do not represent a valid sentence are ignored.
Works fully on a single case.

Need to make it work on multiple cases.
main() function and debug mode created

Main function parses the command line arguments, so that it would be
easy to switch between different modes of calculation. So far, just a
framework for the parameters has been created.

Debug mode involves executing code with pycallgraph. This means, that
pycallgraph.png file will be output with call graph of functions and
their execution profiles.
Global counters of execution

Global counter for matched phrases in current iteration
Global prediction for phrases needed to match
Percent display of current iteration
loose_phrases() moved to a loop

Also, some debug information removed from items_match().