Allow light sources to be visible more than 12 squares away, due to unimpaired_range default of 12 in c1188bf. Changed to SEEX * MAPSIZE which is the limitation of lightmaps cache. Note that this exposes bugs that were hidden in the dark; walls (among other things) appear to have a light value of 2, targeting is still constrained to night time visibility (#251), and headlight beams are short and positively fugly.
Give headlights MORE POWER as they are absolutely pitiful and useless. Temporary fix; headlights are still incredibly fugly, due to how apply_light_arc is hard coded to use a 90 degree beam and constrained in a square region.
Merge origin/master, remove headlight power multiplier
Crackers don't matter
Merge remote-tracking branch 'dda/pr/921' into dda-master
Remove unnecessary comments, and reduce unimpaired_range() to the standard max range.
Only apply daylight on square where player is standing to avoid flooding the lightmap when in less than total sunlight.