Upgrade ncurses. 2/2

- update README.{DELETED,DRAGONFLY}
- adapt Makefiles
- regenerate header files
- import new generated include/comp_userdefs.c
- adjust Symbol.map

Revert "Hack-fix buildworld after the ncurses upgrade."

This reverts commit 6d3bd8e3942560036cf2aec0d98a65819c5f3b4c.

Hack-fix buildworld after the ncurses upgrade.

This seems to be enough to keep it going and buildworld's tic
usage doesn't use any of these features.

ncurses: Upgrade version 5.9 (20110402) => 6.0 (20160305)

The tic program has been updated at the same time.
The symbol maps were expanded using the vendor symbol maps so they
should be more accurat

ncurses: Upgrade version 5.9 (20110402) => 6.0 (20160305)

The tic program has been updated at the same time.
The symbol maps were expanded using the vendor symbol maps so they
should be more accurate than before. Only one new symbol came in
for the 6.0 version, but I didn't see it present in any library.

For now, the ncurses headers are still being installed. They may
be removed later if dports will support it and it doesn't cause
problem with unix specifications. (On DragonFly, the ncurses
base libraries are private so in theory the headers should be too).

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libncurses: Upgrade from version 5.7 to 5.9

For 1100 lines of changes since the release of version 5.7, see
/usr/src/contrib/ncurses/NEWS

Update ncurses to version 5.4.
The framework has been written from scratch and I moved everything into
lib/libncurses to centralize the build process for it.

The man-pages is modified by the build i

Update ncurses to version 5.4.
The framework has been written from scratch and I moved everything into
lib/libncurses to centralize the build process for it.

The man-pages is modified by the build in the ncurses paged so I have added the
modified man-pages here.

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