perl 5.6 is minimum requirement, expect multicall
Perl 5.6 is minimum - remove unused workarounds
fix RT#101067 - GIMME vs. GIMME_V

Applying patch from Father Chrysostomos with changes
add some 5.6 compatibility stuff

* add wrapper for modules not in core of 5.6 but XS
* bump versions of modules failing on 5.6 before
* use base instead of parent