[pmc] Improved WB annotations the first a*-f*.pmc classes

A 2nd eye-pair sees more.
[pmc] Improved WB annotations - [f-i]*.pmc
add local .perldb helper to .gitignore/MANIFEST.SKIP

so that git clean -dxf will not wipe it.
Also fix trailing space in env.pmc
Improve pmc2c deps for PMC/$class.pm libs

depends only on the really used deps.
also sort the deps to generate comparable Makefile