Wrappers are now split in general and specific flexiprep extensions

.../main/scala/nl/lumc/sasc/biopet/extensions/Cutadapt.scala

...rc/main/scala/nl/lumc/sasc/biopet/extensions/Fastqc.scala

...rc/main/scala/nl/lumc/sasc/biopet/extensions/Sickle.scala

flexiprep/nbactions.xml

...la/nl/lumc/sasc/biopet/pipelines/flexiprep/Cutadapt.scala

...cala/nl/lumc/sasc/biopet/pipelines/flexiprep/Fastqc.scala

...a/nl/lumc/sasc/biopet/pipelines/flexiprep/Flexiprep.scala

...mc/sasc/biopet/pipelines/flexiprep/FlexiprepSummary.scala

...cala/nl/lumc/sasc/biopet/pipelines/flexiprep/Sickle.scala

...umc/sasc/biopet/pipelines/flexiprep/scripts/Seqstat.scala

mapping/nbactions.xml