Changes by AMK: Use HAVE_NCURSES_H to include correct header file

Lots of typo fixes (a bit too much cut-and-paste in this module)
Aliases removed: attr_on, attr_off, attr_set
Lowercased the names COLOR_PAIR and PAIR_NUMBER
#ifdef's for compiling on Solaris added (need to understand SYSV curses
    versions better and generalize this)
Bumped version number bumped to 1.6