scripts/digfort: better csv handling
digfort: add start() comment
Update "plants" plugin

* Add "createplant" command, creates a shrub or sapling at the cursor.
* Put help text in command definitions so CR_WRONG_USAGE works properly
Missed parameter in plugin command init
Update plugins to use CR_WRONG_USAGE where appropriate
Merge remote-tracking branches 'jjyg/master' and 'q/master'

Conflicts:
	plugins/stocks.cpp (resolved)
Use df::allocate here for proper compatibility with 40d and earlier
MaterialInfo: fix decoding for COAL subtypes
Fix wrong argument iteration bounds in dfhack.matinfo.find().
Get rid of the std exception.
Hide fake historical figures from legends xml export.
Merge remote-tracking branches 'q/master', 'angavrilov/master' and 'jjyg/master'