data tool: add and remove tags
data tool: new dependencies
Merge branch 'master' of https://github.com/anchor/marquise into data-add-remove
Merge pull request #13 from anchor/data-add-remove

Add add/remove commands to the data tool
Merge branch 'master' into 'add-time-command'

Conflicts:
	marquise.cabal
	src/DataProgram.hs