StorableShow class improved.
In lang.hpp, support for multiple-arguments predicate and monadic functions added.
In pfq-lang/details.hpp, inet_addr and fmap (for std::vector) utility functions added.
C++ Code cleanup...
In pf_q.h, minor changes.
common/yats library updated.
Minor changes, few optional warnings fixed.
Show function for Argument type fixed.
StorableShow class marked final.
Haskell code cleanup...