Fix the age old problem of TTY cursor being reset on exit

Fix the age old problem of TTY cursor being reset on exit

This changeset stops SXEmacs from resetting the text cursor to block on
exit on a Linux console.  It is actually still reset, but it is reset
correctly and now you'll end up with a "normal" cursor instead of a "very
visible" one.

One side-effect of this change is that SXEmacs on a console will now use a
block cursor, but that just adds consistency because that is how things
are in X11 and Xterm anyway.

	* src/ui/TTY/console-tty.h (struct tty_console): Add
	`cursor_invisible_' and `hard_cursor_' for invisible and hard to
	see cursors.

	* src/ui/TTY/redisplay-tty.c (init_tty_for_redisplay): Set
	cursor_visible_ to "vs" and cursor_normal_ to "ve" like they
	should be according to terminfo(5).
	Also add cursor_invisible_ ("vi"), and hard_cursor_ ("HC").

Signed-off-by: Steve Youngs <steve@sxemacs.org>