Change remaining SPKG.txt to SPKG.rst, delete remaining SPKG changelogs

[mkoeppe]

Follow-up from #29633 and #29636.

[mkoeppe]

In #29633, this was done using

for f in build/pkgs/*/SPKG.txt; do pandoc --from=mediawiki --to=rst $f --output=$(dirname $f)/SPKG.rst; git rm -f $f; git add $(dirname $f)/SPKG.rst; done'

with some manual editing afterwards

[mkoeppe]

New commits:

​e2729b7

for f in build/pkgs/*/SPKG.txt; do pandoc --from=mediawiki --to=rst $f --output=$(dirname $f)/SPKG.rst; git rm -f $f; git add $(dirname $f)/SPKG.rst; done

[git]

Branch pushed to git repo; I updated commit sha1. New commits:

​cf6d70d

build/pkgs/*/SPKG.rst: Remove remaining changelogs

[slabbe]

Green bot on top of 9.3.beta2.

I think we should do the same with the README of sage which at some point in time was translated from rst syntax to markdown so that it looks nice on github.com (the good solution at the time was to rename the file README.txt to README.rst, but I arrived to late on the ticket).

[mkoeppe]

Thanks!

[fbissey]

Cannot build the doc in sage-on-gentoo

[spkg     ] /dev/shm/portage/sci-mathematics/sage-9999/work/sage-9999/src-python3_8/doc/en/reference/spkg/pycparser.rst:18: WARNING: duplicate label upstream_contact, other instance in /dev/shm/portage/sci-mathematics/sage-9999/work/sage-9999/src-python3_8/doc/en/reference/spkg/libxml2.rst
[spkg     ] The inventory files are in ../../build_doc/inventory/en/reference/spkg.
Error building the documentation.
Traceback (most recent call last):
  File "sage_setup/docbuild/__main__.py", line 2, in <module>
    main()
  File "/dev/shm/portage/sci-mathematics/sage-9999/work/sage-9999/src-python3_8/sage_setup/docbuild/__init__.py", line 1730, in main
    builder()
  File "/dev/shm/portage/sci-mathematics/sage-9999/work/sage-9999/src-python3_8/sage_setup/docbuild/__init__.py", line 343, in _wrapper
    getattr(get_builder(document), 'inventory')(*args, **kwds)
  File "/dev/shm/portage/sci-mathematics/sage-9999/work/sage-9999/src-python3_8/sage_setup/docbuild/__init__.py", line 569, in _wrapper
    self._build_everything_except_bibliography(lang, format, *args, **kwds)
  File "/dev/shm/portage/sci-mathematics/sage-9999/work/sage-9999/src-python3_8/sage_setup/docbuild/__init__.py", line 555, in _build_everything_except_bibliography
    build_many(build_ref_doc, non_references)
  File "/dev/shm/portage/sci-mathematics/sage-9999/work/sage-9999/src-python3_8/sage_setup/docbuild/__init__.py", line 295, in build_many
    _build_many(target, args, processes=NUM_THREADS)
  File "/dev/shm/portage/sci-mathematics/sage-9999/work/sage-9999/src-python3_8/sage_setup/docbuild/utils.py", line 289, in build_many
    raise worker_exc.original_exception
OSError: /dev/shm/portage/sci-mathematics/sage-9999/work/sage-9999/src-python3_8/doc/en/reference/spkg/libnauty.rst:33: WARNING: duplicate label upstream_contact, other instance in /dev/shm/portage/sci-mathematics/sage-9999/work/sage-9999/src-python3_8/doc/en/reference/spkg/cffi.rst

There are multiple instances of upstream_contact being Upstream Contact and that seem to throw sphinx off, at least here.

[git]

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

​b98bcbb	for f in build/pkgs/*/SPKG.txt; do pandoc --from=mediawiki --to=rst $f --output=$(dirname $f)/SPKG.rst; git rm -f $f; git add $(dirname $f)/SPKG.rst; done
​047ffcb	build/pkgs/*/SPKG.rst: Remove remaining changelogs
​224059a	Fix up RST syntax

[chapoton]

ok, let us try again

[mkoeppe]

Thanks.