This is an initial round of SAFERHANGUP hangup changes. It introduces
SAFERHANGUP, provides the core framework, and enables it for UNIX.
Window-port changes are provided for win/tty, win/X11 and win/gnome. Qt
changes should be forthcoming after having Warwick look at them.
window.doc is updated so windowport maintainers have an clue what needs to
be done to support SAFERHANGUP.
- change the way the tile sizes are calculated, based on the image size,
so non-square tiles can once again be supported.
- fix Gnome port so it can actually display non-square tiles, several
height/width uses were backwards
- update Install.X11 to note the number of tiles per row in the XPM image
- support X11 tile files (with or without XPM) that are 40 tiles wide
- rearrange some X11 code to share more code between XPM & non-XPM options
- clean out some deprecated X11/winmap.c #ifdefs
- update Qt code minimally to handle such an XPM file
