ncurses 5.9 - patch 20150425

ncurses 5.9 - patch 20150425

+ expanded description of tgetstr's area pointer in manual page
  (report by Todd M Lewis).
+ in-progress changes to modify test-packages to use ncursesw6 rather
  than ncursesw, with updated configure scripts.
+ modify CF_NCURSES_CONFIG in Ada95- and test-configure scripts to
  check for ".pc" files via pkg-config, but add a linkage check since
  frequently pkg-config configurations are broken.
+ modify misc/gen-pkgconfig.in to include EXTRA_LDFLAGS, e.g., for the
  rpath option.
+ add 'dim' capability to screen entry (report by Leonardo B Schenkel)
+ add several key definitions to nsterm-bce to match preconfigured
  keys, e.g., with OSX 10.9 and 10.10 (report by Leonardo B Schenkel)
+ fix repeated "extra-suffix" in ncurses-config.in (cf: 20150418).
+ improve term_variables manual page, adding section on the terminfo
  long-name symbols which are defined in the term.h header.
+ fix bug in lib_tracebits.c introduced in const-fixes (cf: 20150404).