Added serialise statement to Lang and a push_front function to ZStar<Z>::Vector
Made default make output less verbose and memorax-gui executable by default
Changed flag --std=c++0x to --std=c++11 since they are equivalent and c++0x is deprecated.
Added check for range-based for loops to configure script.
Started work on PwsConstraint::Common constructor and PwsConstraint::pre.
More work on PwsConstraint::pre and required related work.