improved PVS parser to support constants of type string (addresses issue #182)
addresses issue #186
minor improvement for the Emucharts Text editor
minor change in createWidget template -- now click event of button widgets is selected by default
Merge commit 'b3b5a9ad5d291615b304b4d5f7f4acf3717ef22a' into alpha

* commit 'b3b5a9ad5d291615b304b4d5f7f4acf3717ef22a':
  minor change in createWidget template -- now click event of button widgets is selected by default
  minor improvement for the Emucharts Text editor
  addresses issue #186
  improved PVS parser to support constants of type string (addresses issue #182)
fix for the use of undeclared variable in TreeList