* Update and fix bcftools package
This PR updates bcftools to 1.10.2 and is dependent on PR #14504.
This PR also fixes builds of other versions. Versions 1.2-1.4 did not
use autotools so when the packaeg was converted to use autotools with
version 1.6 those older versions could no longer build. Also, those
versions needed to be patched to use an external htsllib. The method of
finding the external htslib is also different for those older versions.
In addition, this PR adds two variants to bcftools:
- libgsl
- perl-filters
Finally, dependencies for perl and python are added, and an unused
dependency for libzip was removed.
* Do not use '@' in variant description
The '@' character in a variant description will cause a problem with
`spack info`.
```
==> Error: Incomplete color format: '@' in
expressions, for @1.8:
```
* Fix error with python2 processing this package
We'd like to use a consistent checksum scheme everywhere so that we can:
a) incorporate archive checksums into our specs and have a
consistent hashing algorithm across all specs.
b) index mirrors with a consistent type of checksum, and not one that
is dependent on how spack packages are written.
- [x] convert existing md5, sha224, sha512, sha1 checksums to sha256
- remove the old LGPL license headers from all files in Spack
- add SPDX headers to all files
- core and most packages are (Apache-2.0 OR MIT)
- a very small number of remaining packages are LGPL-2.1-only
