missing tests and mappings for use cases ro-5+6+4b
[WIP] allowing p2gams to have submappings
[WIP] before changing from inheritance to delegation for generated
classes
[!!!] first set of changes, inheritance 2 delegation refaktoring
[WIP] continued replacing inheritance by delegation
almost finished introduction of object adapter to access rdf2go
inherited by problems + clean up and fix some exception handling
use sub mapping method from super class
handle target graphic attributes only as properties

+ exceptions improved
better exception handling d3 generator
fix example not generating any output
change logging level
set represented resource for label GOs
make delegatee private and fix to string method
use graphic object list instead of set to ease json compare
store represented resource in AVM, not in POJOs
order GOs to yield sorted json nodes for better comparison
improve pom to enable testing with maven
comments added during bug searching
some clean up of mapped value extension during bug searching