Introduce inline namespace for literals.
memory: add a missing check when resizing a vector and a couple of minor style changes.
mp_integer: add the "_z" user-defined literal.
mp_rational: user-defined literal "_q" and more pieces for the arithmetic ops (to be tested
and documented yet).
Merge branch 'master' of github.com:bluescarni/piranha
memory: in the smart pointer functor, clarify limits of usage and test move semantics.