introduce PRIll (printf format) and SCNll (scanf) in misc.h.
This needs to have config.h included beforehand.
* do likewise with freq_t type (double) in rig.h
FREQFMT is deprecated.
git-svn-id: https://hamlib.svn.sourceforge.net/svnroot/hamlib/trunk@1903 7ae35d74-ebe9-4afe-98af-79ac388436b8