Replace a few tabs, remove a few trailing spaces, and shorten a few
long lines.
Readme still needs another fix: if falsely claims to contain all bug
fixes since 3.6.4. I wasn't sure how to reword that so didn't try.
Also, fix a couple of old typos in Install.vms.
set_tile_type frees tileset memory not in use for the current tile
type (paletted or full color).
stretch_tile and free_tile support resizing tiles at run time.
Some BIOSes allow calling the window function directly, bypassing the
logic that distinguishes this call from other BIOS calls. Should be
faster on some systems.
This was not previously done because the palette was not correctly set
up, and QEMU gave incorrect colors. The palette setup function now
falls back to the standard BIOS function if the VESA BIOS function
fails, which resolves the issue with QEMU. The mode selection logic now
favors 8 bit color if the tile set is compatible.
Using 8 bit mode means fewer writes to memory and fewer uses of the
BIOS window function.
Try a lot harder to keep terrain/level flags in a sane state. They're
overloaded so it's not simple.
Creating a fountain or sink incremented the corresponding counter (for
controlling ambient sounds) but removing one by wishing for something
else in its place didn't decrement.
Allow wish for "disturbed grave" to create a grave with the 'disturbed'
flag set, similar to existing "magic fountain" and 'blessedftn' flag.
(I didn't add "looted throne", "looted tree", and several other things
that use the 'looted' overload of 'rm.flags'.)
Automate block_point (tree, cloud, secret corridor, or secret door in
open doorway) and add unblock_point (use Pass_wall to move into wall
or tree or stone, or just walk onto a cloud, then make iron bars or
almost any other wishable terrain to replace the blocking feature).
Make long worms grow more slowly (although that didn't seem to make
as much a difference as expected) and limit the amount of HP they
acculate if they shrink and then re-expand. Shrinking doesn't take
away max HP but growing used to always add to max. Now it won't add
to max HP unless the number of segments is at that worm's peak, so
shrinking will inhibit the exhorbitant HP expansion that idle worms
have had.
