Recognize 10.10 in fink

Initial patch from edman007 in #fink.
Update SDKs for 10.10
Update docs to mention 10.10.
Xcode versions and appropriate receipt to check for.
Special thanks to Andrew Laurence for the latter.
Officially support  10.9.4
Remove items specific to the separate fink-mirrors package to reduce the chance of having newer mirrors here than in fink-mirrors.
Sync with fink-mirrors-0.37.0.1
Note that 10.9.4 has been tested.
5.18.2 is now default system Perl.
OK, so we're back to CLTools_Executables.
Perl-5.18.2 doesn't like bare numbers  (0 seems to be OK for some reason)
10.10 revision
Revert "Perl-5.18.2 doesn't like bare numbers  (0 seems to be OK for some reason)"

This reverts commit ad8279c13e675c8bb7950ce3581071d97b5fe34f.
Fix POD syntax of numeric =item

The value of =item cannot be simple numbers unless intending to create
a monotonic list starting at 1 (a numbered list rather than arbitrary
strings). Use Z<> to make them look like non-numeric strings.
POD tweak: Use term/definition rather than bullet-list to define values
POD fixes for =item syntax (sync with text-parsewords-pm-3.29-2)
Merge branch 'master' into HalfDome
Needs perl-5.18 for Yosemite
Remove tests for unsupported OS X.
Don't test for later OS X if we've already defined $perlexe.