Add corresponding MIN_* values for MAX combat values

Closes #552

This includes supporting minimum values for:
* absorb
* block
* elemental resistance
* avoidance
Merge pull request #630 from dorkster/min_combat

Add corresponding MIN_* values for MAX combat values
Codingstyle: Use the wiki entry, add examples, talk about brackets
Merge pull request #619 from stefanbeller/codingstyle

Codingstyle: Use the wiki entry, add examples, talk about brackets
Merge remote-tracking branch 'upstream/master'