fixed issues
- fixed bug in grid from survey workflow (issue#3)
- fixed issue in preview thematic dialog box (issue#5)
- fixed issue with multiple overlapping description of values in modifier attribute entry (issue#9)

updates
- updated taxonomy to latest version
  - added functionality to retrieve related values for given attribute
- updated test cases to latest version of code
  - still need to add more assertion tests
- minor code refactoring: replace QMessagebox calls with logUICall.log
- minor text editing
- replaced logo