ATAC seq config

@s.a.j.van_der_zeeuw kun je even kijken of er nog iets mist?

See merge request !425

Feature bamstats

Fixes #308 

- [x] Multi sample base with scala futures
- [x] Base stats like total number of reads
- [x] mapping quality histogram
- [x] insertsize histogram
- [x] Clipping stats

- [x] Add unit testing

See merge request !435

Fix basecounter

Fixes #377 and #378 

See merge request !440

Added option to correct memory for threads

Fixes #376 

See merge request !439

# Conflicts:
#	biopet-tools/src/main/scala/nl/lumc/sasc/biopet/tools/BiopetFlagstat.scala

Added text to args

Fixes #373 

See merge request !437

Add updates to addres issue #371

See #371 for reference

Fixes  #371

See merge request !438

fix for #372

Fixes #372 

See merge request !436

Added extra documentation

fixes #363 

See merge request !433

Added initial version of release notes

Fixes #362 

See merge request !430