ncurses 6.0 - patch 20150606

ncurses 6.0 - patch 20150606

+ make ABI 6 the default by updates to dist.mk and VERSION, with the
  intention that the existing ABI 5 should build as before using the
  "--with-abi=5" option.
+ regenerate ada- and man-html documentation.
+ minor fixes to color- and util-manpages.
+ fix a regression in Ada95/gen/Makefile.in, to handle special case of
  Cygwin, which uses the broken-linker feature.
+ amend fix for CF_NCURSES_CONFIG used in test/configure to assume that
  ncurses package scripts work when present for cross-compiling, as the
  lessor of two evils (cf: 20150530).
+ add check in configure script to disallow conflicting options
  "--with-termlib" and "--enable-term-driver".
+ move defaults for "--disable-lp64" and "--with-versioned-syms" into
  CF_ABI_DEFAULTS macro.