`last/mafconvert`: add read group IDs and sort SAM/BAM/CRAM files.

[charles-plessy]

Just after I started to use this module to produce BAM files, my users asked if I can provide thes BAM files already sorted. Sorting is necessary for indexing, which is necessary for random access and display on browsers.

I can't think of a workflow where the performance or the ease of use would be worsened when SAM/BAM/CRAM files are sorted by default. Therefore I think that it is best to sort these files on the fly in this module.

In addition, this MR also adds a read group with ID and sample name the same as meta.id for all converted alignments. This makes it easy to concatenate files where different queries are aligned on the same target.

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