Added comments to src/*.{h,c} files
Bots eat apples when low on stamina
Properly ignoring files in listings

Files whose names start with a "." are to be ignored.
Merged AI's 'gather' and 'make' methods
Delegated finding of component source to universe

Added methods 'universe_mineFor' and 'universe_buildFor' that search
for a type of mine or building that allows to harvest or make a component.
Bots gather base materials last
Added memory to bots

Bots remember what instructions they have already completed. This avoids
them from looping back in their program to match previous constraints.
Minor: fixed check for bot's remainng work
Added option to avoid bot from destroying her home
Bots make items as a job
Bots transform materials as a job (e.g. planks)