ncurses 5.6 - patch 20070303

+ regenerated html documentation.
+ add NCURSES_OPAQUE symbol to curses.h, will use to make structs
  opaque in selected configurations.
+ move the chunk in lib_acs.c which resets acs capabilities when
  running on a terminal whose locale interferes with those into
  _nc_setupscreen(), so the libtinfo/libtinfow files can be made
  identical (requested by Miroslav Lichvar).
+ do not use configure variable SHLIB_LIBS for building libraries
  outside the ncurses directory, since that symbol is customized
  only for that directory, and using it introduces an unneeded
  dependency on libdl (requested by Miroslav Lichvar).
+ modify mk-1st.awk so the generated makefile rules for linking or
  installing shared libraries do not first remove the library, in
  case it is in use, e.g., libncurses.so by /bin/sh (report by Jeff
  Chua).
+ revised section "Using NCURSES under XTERM" in ncurses-intro.html
  (prompted by newsgroup comment by Nick Guenther).