Removed excessive comments in character model
New calc functions in:
- Hitpoints
- Current hitpoints
- Feats

Changes data in database for testing.
Get_nodes is used to get subsets of nodes easily.
Added basic math for a lot of basic stats.
Added green/orange/red system to denote if a value is calculated or a
placeholver.
Added bonustype field to nodes.
Updated DB_scheme and DB_data.
Proof of concept: Armor class works completely.
Merge pull request #7 from saekort/charsheet_basic_math

Charsheet basic math