Provide Delly specific filtering on paired end and split read evidence. Prepare Delly specific exclude file
Move datadict lookups, set globals instead of using a class.

It is safe to do this with globals. locals has this warning in the
python docs:

'The contents of this dictionary should not be modified; changes
may not affect the values of local and free variables.'
globals does not have the same warning so it should be safe to modify
Add dexseq_gff, rRNA and the refFlat file to the genome resources.
Run dexseq from a bcbio-dict with unit test.
Fix for new downsample function signature.
Remove skip of dexseq unit test cleanup.
Add optional global defaults to the datadict.
Add DEXseq to rnaseq pipeline.
Expose algorithm keys we avoid processing on to use from bcbio_vm data preparation code
Add support for fastqc 0.11+ with combined single HTML file output (Fixes chapmanb/bcbio-nextgen#512)
last version of Brad's branch
fix qsignature function at second step
add qsignature_summary as multitask step