issue #274: add testcases, not repro

Only fails with -O4 and CC.
I guess it was fixed with 1.42_06 (the last reset did not work)
MANIFEST: updated via git ls-tree -r --name-only HEAD

missed several important files, like Stash/Stash.xs
.gdbinit, .perldb, several non-stable BcVersions, log.modules*
ramblings/

added test core suite (for 5.14 only yet)
with symlinks: tar should copy them on windows