Do not run RSeQC tin.py by default

[drpatelh]

Description of feature

A number of users have reported that the RSeQC tin.py module added in v3.4 is causing issues - mainly due to very long run-times. By default, the module has a label of process_medium which means it runs for 8 hours but is still failing. I don't think it makes sense to have such a long running QC step on by default in the pipeline and as such it should be opt-in rather than set by default.

Once it has been removed you can run tin.py by appending tin to the --rseqc_modules parameter like below:

--rseqc_modules 'bam_stat,inner_distance,infer_experiment,junction_annotation,junction_saturation,read_distribution,read_duplication,tin'

[drpatelh]

Process label bumped to process_high in nf-core/modules#1327, re-installed in the pipeline and made opt-in in #771