Add 1.7.2 plant materials.
1.7.2 sediment materials.

- Red sand equals sand. In most biome's, it's not going
  to get degraded further, but if deposited into an ocean or
  other wet biome, it'll turn into clay as normal.
- hardened clay and stained clay are considered as hard as
  stone (e.g. sandstone) in minecraft (see wiki). For that
  reason, we'll consider these equivalend to sandstone and
  cobblestone, so they degrade into gravel and are not
  very movable.
Copy block data too.

This prevents podzol, red sand, colored clay from losing
it's color or turning to regular sand/dirt.