MAGN-1130
MAGN-1129
Add equality comparisons on unit types with tests.
fixed mapping number->unit nodes

issue #1011
added basic unit test convenience method
test for #1101
updated param getter/setter to work on all elements

#1040 and MAGN-1071
fixed bad null value propagation
Begin MAGN-998. About window is in.
Update colors on about window.
Merge branch 'master' of github.com:DynamoDS/Dynamo