removes .pl extensions to match the modified program names in /usr/bin

(this is for consistency with all the other files in scripts/)
fix POD errors

#  most of these are misplaces/missing =over
#  plus a mistyped N<..> instead of B<..>
# Upstream-Bug: http://rt.cpan.org/Ticket/Display.html?id=41898
fix even more pod errors

this was forwarded as
https://rt.cpan.org/Public/Bug/Display.html?id=88750
name scripts as they are called in POD (delete .pl suffix)

this one is somewhat experimental, in that the renaming of the files
happens in a different way in Debian and I haven't tested it this way