ncurses 5.6 - patch 20070728

ncurses 5.6 - patch 20070728

+ make _nc_capalias_table and _nc_infoalias_table private, accessed via
  _nc_get_alias_table() since they are used only by parse_entry.c
+ make _nc_key_names private since it is used only by lib_keyname.c
+ add --disable-big-strings configure option to control whether
  unctrl.c is generated using the big-string optimization - which may
  use strings longer than supported by a given compiler.
+ reduce relocation tables for tic, infocmp by changing type of
  internal hash tables to short, and make those private symbols.
+ eliminate large fixed arrays from progs/infocmp.c