add KnimeScriptingException
use KnimeScriptingException for better error handling when creating Rconnection
R-scripting - "append columns" default set to "false" to quick fix error message of expected table specs
R-scripting - add new preference "use evaluate package", fix default links to templates
R-scripting - fix R-plot default script, prepare rownames transfer (TODO: retrieve from KNIME, push to KNIME), improve reporting of error-messages and warnings (TODO: create console view), cleanup code
ignore UML-files from Eclipse plugin ObjectAid Class Diagram
Merge branch 'improve_r_scripting' into develop