Changes for version 0.52
- Contains XS code changes from List::MoreUtils 0.415 ...
- fix RT#75727 - after's XS implementation call XSRETURN(-1) when it doesn't find an element (2nd patch provided by Reini Urban, regression test provided by Tony Cook)
- fix RT#113117 - XS's minmax() sometimes return undef (perl >= 5.20), thanks PERLANCAR and SREZIC
- explicit test for thesis in RT#110998 - XS implementation of pairwise fails with memory allocation error when there are more return values than in original lists -- thesis is proven wrong
- efficiency improvements by bulk88
- improve some tests to get clearer reports
- List::SomeUtils::XS - XS implementation for List::SomeUtils