Add CHROMAP as aligner

[JoseEspinosa]

From CHROMAP pre-print it is stated that chromap performs similarly in terms of accuracy to bwa while it is 10X faster. Might be interesting to enable it use.

[drpatelh]

This would be awesome!! We could have a separate sub-workflow for this like we do with bwa_mem and add an --aligner option to select. I have been thinking it would be relatively easy to have a similar workflow for Bowtie2 as well for complete flexibility at the user-level (as mentioned in #160)

[JoseEspinosa]

I tried to implement chromap as an available aligner but found this issue haowenz/chromap#59 that should be fixed in v0.2.0, will need to update the module and try again.

[JoseEspinosa]

I open a PR on the BioContainers multi-package-containers repo, once the container is created I will bump the new version in the chromap module

[JoseEspinosa]

Closed in #267