Sort choices in node editor.
This was copied off branch jingxian2
code restructuring for bug 2414
modified path css for automatic node creation
Root node selector relocated

The "root" checkbox is now in a individual row between "type" and
"inputs".
Merge branch 'master' into pradeep
Clean up code.  Add comment referencing Bug #2414.
added documentation as well as testing
added test installation instruction
Delete TestInstallation.docx
Merge branch 'master' into sachin