v190: better Python Transform WK-39, bug fixes.
save research progress ...
some cleaning in the code
Fixed log4j problem
No more "orphan" columns
Possible fix for blank node uri generation

Not extensively tested.
Clean up imports
Removed references to columnsCovered

Updated sesamemodelparser so it compiles, but no way to test it.
added JsonSerializer for Graph

Examples of use:
GraphUtil.exportJson(graph, filename);
graph = GraphUtil.importJson(filename);
Merge branch 'rdf_generation_blank_node_fix' into development
Merge branch 'no-orphans' into development
v192: no orphans + Jason's fixes to RDF generation
Merge branch 'development' into gui_improvements
Merge branch 'gui_improvements' of https://github.com/InformationIntegrationGroup/Web-Karma into gui_improvements