remove coala (outdated)

last coala release (0.11.0) is now over 6y old.

when using pip install coala, a ton of stuff gets installed (expected)
and a part of that downgrades some stuff we use to outdated, incompatible
versions.

when trying to run coala with python 3.11, it just crashes because the
last release was made for py35/py36 (as seen in their setup.py).

a lot of PRs and tickets pile up at the coala project on github,
but noone is maintaining it.

.coafile

@@ -1,35 +0,0 @@
-[all]
-# note: put developer specific settings into ~/.coarc (e.g. editor = ...)
-max_line_length = 255
-use_spaces = True
-ignore = src/borg/(checksums.c|chunker.c|compress.c|hashindex.c|item.c),
-         src/borg/crypto/low_level.c,
-         src/borg/platform/*.c
-
-[all.general]
-files = src/borg/**/*.(py|pyx|c)
-bears = SpaceConsistencyBear, FilenameBear, InvalidLinkBear, LineLengthBear
-file_naming_convention = snake
-
-[all.python]
-files = src/borg/**/*.py
-bears = PyDocStyleBear, PyLintBear
-pylint_disable = C0103, C0111, C0112, C0122, C0123, C0301, C0302, C0325, C0330, C0411, C0412, C0413, C1801,
-                 I1101,
-                 W0102, W0104, W0106, W0108, W0120, W0201, W0212, W0221, W0231, W0401, W0404,
-                 W0511, W0603, W0611, W0612, W0613, W0614, W0621, W0622, W0640, W0702, W0703,
-                 W1201, W1202, W1401,
-                 R0101, R0201, R0204, R0901, R0902, R0903, R0904, R0911, R0912, R0913, R0914, R0915,
-                 R0916, R1701, R1704, R1705, R1706, R1710,
-                 E0102, E0202, E0401, E0601, E0611, E0702, E1101, E1102, E1120, E1129, E1130
-pydocstyle_ignore = D100, D101, D102, D103, D104, D105, D200, D201, D202, D203, D204, D205, D209, D210,
-                    D212, D213, D300, D301, D400, D401, D402, D403, D404
-
-[all.c]
-files = src/borg/**/*.c
-bears = CPPCheckBear
-
-[all.html]
-files = src/borg/**/*.html
-bears = HTMLLintBear
-htmllint_ignore = *

MANIFEST.in

@@ -1,7 +1,7 @@
 # stuff we need to include into the sdist is handled automatically by
 # setuptools_scm - it includes all git-committed files.
 # but we want to exclude some committed files/dirs not needed in the sdist:
-exclude .coafile .editorconfig .gitattributes .gitignore .mailmap Vagrantfile
+exclude .editorconfig .gitattributes .gitignore .mailmap Vagrantfile
 prune .github
 include src/borg/platform/darwin.c src/borg/platform/freebsd.c src/borg/platform/linux.c src/borg/platform/posix.c
 include src/borg/platform/syncfilerange.c

docs/development.rst

@@ -217,26 +217,6 @@ Important notes:
 - When using ``--`` to give options to py.test, you MUST also give ``borg.testsuite[.module]``.
 
 
-Running more checks using coala
--------------------------------
-
-First install coala and some checkers ("bears"):
-
-::
-
-  pip install -r requirements.d/coala.txt
-
-You can now run coala from the toplevel directory; it will read its settings
-from ``.coafile`` there:
-
-::
-
-  coala
-
-Some bears have additional requirements and they usually tell you about
-them in case they are missing.
-
-
 Adding a compression algorithm
 ------------------------------
 

requirements.d/coala.txt

@@ -1,5 +0,0 @@
-# style and other checks for many languages.
-# some bears (checkers) have additional requirements.
-coala
-coala-bears
-