Add tests for expression module #370

Job	Run time
quick-tests (sanity)	2m 7s
quick-tests (dry-run)	2m 1s
quick-tests (utilities)	2m 8s
quick-tests (report)	1m 56s
quick-tests (scripts)	1m 52s
quick-tests (docs)	1m 59s
functional-tests (qc-seq)	3m 15s
functional-tests (snv-indels)	7m 12s
functional-tests (itd)	4m 27s
functional-tests (fusion)	4m 14s
functional-tests (expression)	2m 52s
functional-tests (test-hamlet-targetted-RNA)	12m 55s
functional-tests (test-hamlet-chrM)	15m 43s
	1h 2m 41s

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