added generic R Node to GenericWrapper, along with an exemplary R script and TOPPAS pipeline
minor
renamed
minor
fixed TOPPAS edge crash when connecting Input and Merger node; finished Example TOPPAS pipeline and R script
Merge pull request #794 from cbielow/WrapR

Generic Wrapping of R scripts using GenericWrapper
[FIX] removed isValid and sequence_string_ from AASequence
Merge branch 'develop' into feature/AASequence_refactoring