nextNEOpi_v1.2.1

This release fixes issues encountered when running nextNEOpi with the conda profile (-profile conda)

Main changes:

• work around for incomplete GATK3 conda installation by downloading gatk3.8 jar and running gatk-register
• fix nextNEOpi conda yml file by setting pysam version 0.16
• use separate conda env for IGS
• check for correct conda channels when using conda profile
• reduce the default number of CPUs in conf/process.config example
• add tag in collectSampleInfo process
• doc: add a note about WGS data to README.md

Thanks to @aneichyk for reporting and testing.