Find cur_year_tick_advmode in devel/find-offsets.lua
Fix search for cur_season_tick and cur_season in devel/find-offsets.

It seems the one-off error is a problem with the original
save I used, and not the result of some general behavior.
Merge branch 'master' of https://github.com/warmist/dfhack

Conflicts:
	plugins/rendermax/renderer_light.cpp
Still broken. Needs boundary checking.
Merge branch 'master' of https://github.com/warmist/dfhack

Conflicts:
	plugins/rendermax/renderer_light.cpp
Merge branch 'master' of https://github.com/warmist/dfhack
Added some fast checking for obstacles around lights, resulting in a huge speedup outside.
Made the low water check actually use floats.
Merge branch 'master' of git://github.com/JapaMala/dfhack
Merge branch 'master' of git://github.com/jjyg/dfhack