Fixed bug #29 where ddg.save would print out NULL
Changed .ddg.is.simple to return false for lists

Fixed a bug in .ddg.loadhistory that caused it to fail if the last
line in the file was the timestamp.

Fixed a bug when processing outs.data parameter of ddg.procedure so 
that a variable name can be passed in as a name, not just a string.
Same thing for ddg.data.
Merge branch 'master' of https://github.com/blernermhc/RDataTracker

Conflicts:
	DESCRIPTION
	R/RDataTracker.R
Preliminary implementation of dynamic on/off console nodes
Documentation updates for preliminary ddg.console.{on/off} functions
If the history file is created, it will be deleted. Added a .ddg.is.set function to check for local ddg variables. Console node code seems to be working as expected