To test 16-color mode, specify OPTIONS=video:vga explicitly;
autodetect will choose a VESA mode if it can.
* Draw tiles correctly when redrawing from panning or from changing
the map mode among text, tiles and overview. Previously, this would
draw everything with the tile at the hero's position.
* Draw corridor walls with the stone tile.
* Map the statue colors to the nearest neutral tone among the main
16 colors. This mainly affects altars and female cats.
* Fix the code that shows statues as the generic statue tile. This
code could be deleted, but the statues don't draw with the full
range of gray tones.
* Document the option OPTIONS=video:vesa.
The pull request included some changes that were neither accidental nor
unintentional, so only a subset of the changes from pull request #869
submitted by klorpa were manually applied.
behaviour -> behavior
speach -> speech
knowlege -> knowledge
incrments -> increments
stethscope -> stethoscope
staiway -> stairway
arifact -> artifact
extracing -> extracting
The uses of "iff" were left alone.
Close#869
