2. changed key_* to el_ley_* in the libedit key.h
   (because it's in the conflict with the aix definitions)
3. use libedit_term.h instead of term.h in the cmd-line-utils/libedit/el.h
4. added definition of MIN in the cmd-line-utils/libedit/read.c 
   (if it wasn't defined yet)
5. discarded definition of SUNOS macro from configure.in 
   (now we don't include term.h in the el.h at all)