Update latest 'best practise' aDNA mapping parameters

[jfy133]

Is your feature request related to a problem? Please describe

A new publication was just published describing more in-depth parameter modelling to find the most optimal paramaters for mapping with a range of mappers.

Of note they find the best parameters for BWA are turnning of seeding, -n 0.01, and a gap -o 2. I also just noted this is also what was selected by the old as F Mammoth

Describe the solution you'd like

Consider updating default mapping paramaters to reflect the above, and add the gap parameter

Describe alternatives you've considered

Leave it as it is, as the papers don't disagree and we don't know which is best.

Additional context

[jfy133]

We can at least add the bwa -o parameter to bwa options, even if we don't modify defaults

[jfy133]

Updated bwa aln to recommendations from Oliva et al.