Migration to htslib ecosystem 1.20.

Hi all,

Some of the htslib packages were already available in their 1.20
version counterpart, so I tried to finish the migration
yesterday as I had some time.  I seem to have fumbled a bit the
samtools upload by forgetting to declare it requires libhts-dev
1.20 specifically, as otherwise tests are not passing.  Giveback
attempts are still capturing htslib 1.19, so I prepared a
samtols upload with bumped build dependency version.  In the
meantime, there may be stray uninstallable samtools-test
packages in sid, as the arch-all package build went through, but
not the arch-anys.  Otherwise not too much to worry about.

If everything goes according to the plan, the htslib 1.20
ecosystem should be consistent in testing in a couple of days.

Have a nice day,  :)
-- 
  .''`.  Étienne Mollier <[email protected]>
 : :' :  pgp: 8f91 b227 c7d6 f2b1 948c  8236 793c f67e 8f0d 11da
 `. `'   sent from /dev/pts/2, please excuse my verbosity
   `-    on air: Touchstone - Wintercoast

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