Merge remote-tracking branch 'upstream/master'
Made use of libreadline m4 method to recognize libunicodenames library

library has trouble being found with AC_SEARCH_LIBS() when used on the Mac.
Merge pull request #483 from JoesCat/2013mar26_relaxTest

2013mar26 relax test
https://github.com/fontforge/fontforge/issues/401#issuecomment-15685269 confirms that the current configure.ac test does not see libunicodenames.
Implementing this pull request to activate "	Made use of libreadline m4 method to recognize libunicodenames library" (The other patches seen in this pull request have already been added earlier).