Backing up with a README and plant density data sample

data set is ~ 35k samples from a single world. more samples
may be needed, and I have not verified all biomes were found
in this sample set yet.
Implement plant scan/report tool, fixes

Most of the fixes were found while scanning for plants:
- data value needs to be stripped for many plant types
- wrap data get/set functions to suppress deprecated warns
- randomly orient top blocks for doubleplants
- add scan code
Enable region protection.

This is a merge of the code in Sedimentology and supports:
- old 1.6 factions
- factions 2+
- worldguard
- regionprotect
- towny

protection is on by default, and can be disabled in a config.yml
Importing a base data set.

Obtained from scanning an actual world. Stripped from
flower data except sunflowers. Simplified biomes in
the same way the plugin reduces them.