move KEEP/package.template -> KEEP/pkg_skel/autoconf

pkg_skel will contain pkg templates for several build system types.
add template for perl/cpan pkg
add template for python pkg
README.md: update paragraph mentioning package templates
git: fix path where perl modules end up

i have not been able to determine without big effort where the
perl "syslibdir" is queried, so simply moving it to the right place
has to suffice for the moment.
libnl-tiny: update to latest
iw, wpa-supplicant: update for latest libnl-tiny