Fix whitespace

- remove trailing whitespace
- remove duplicate blank lines
- remote blank lines at end of file

Fix licenses

Redone concatenations using "foo %s" % bar

During the code review for the insertion of visualCAmkES into the next branch
I was adviced to change the string concatenations from "foo" + "bar" to "foo %s" % bar.
This commit makes this change across the visualCAmkES code.

JIRA: CAMKES-490

Opening properties requires double click. Prevents accidental click.
JIRA CAMKES-477

Created property widgets and associated integration logic

This commit addresss the issue: JIRA CAMKES-477
Property widgets are made for instance and connections
Graph_widget will open the appropriate property widget when a widget is clicked
Property widgets are "dock widgets" in QT terminology

Finding quoted names.
Special characters like _ are dealt in graphviz by putting quotes around
the name. So if a node couldn't be found, a check is done to see if the name
was quoted.

Removed unnecessary prints

Preparing for camkes-tools next branch merge