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__main__.py: Invokes coala as module

This allow coala to be invoked as a module by
using the -m tag.

Closes coala#5667

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ConfigurationGathering.py: Document functions

Documents get_all_bears and get_filtered_bears
stating their unsorted nature of result.

Closes coala#5654

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Collectors.py: Document functions

Documents collect_bears, collect_bear_by_aspects,
get_all_bears, get_all_bears_names and
collect_all_bears_from_sections stating their
unsorted nature of result.

Closes coala#5654

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languages: Add missing language imports

This adds missing language imports to `__init__.py` of
`languages`.

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aspects: Default languages=all when using aspects

This ensures that there is no need to pass `languages` argument
for bears supporting all languages by using a tuple containing
all language instances as default for bears when they are run
via aspects or both aspects and settings.

Closes coala#5655

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coalaTest: Remove unnecessary second patch

This may have been necessary when autocompletion
was first added, but it is not needed any longer,
and the function being patches needs to be
removed.

Closes coala#5671
Related to coala#5664

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DefaultArgParser: Restructure argcomplete support

Use a global symbol for the import, to avoid
multiple invocations of `import` and so that
the optional import can be tested, adding
coverage of that scenario using a mock import.

Also avoid the lambda in order to have coverage
of that line.

Delay loading of coalib.collecting.Collectors
as default_arg_parser is called from setup.py,
and coala-utils may not be installed yet.

Add test cases which exercise the possibilities
of unavailable imports.

Related to coala#4166
Related to coala#5664

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Constants: Move USER_DATA_DIR to CachingUtilities

USER_DATA_DIR depends on library appdirs, which must not be
imported during argument parsing otherwise the manpage builder
can not load the argparser during setup.

It is only used from CachingUtilities, so it has been moved
there.
However for backwards compatibility, CachingUtilities sets
USER_DATA_DIR when it loads.

Fixes coala#5664

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Debug_bears.rst: Add Debugger Settings docs

Related to coala#1101

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VisualBasic: Add `max_line_length`

Some langauges have language specific line length restriction.
This adds `max_line_length` restriction for VB.

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setup.py: Sync

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.circleci/: Install test-requirements.txt first

test-requirements.txt contains overrides needed to ensure
pip installs suitable versions of dependencies, especially
of pip.

Also move pytest before installing dependencies of coala-ci.

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requirements.txt: Add versions to VCS egg names

setuptools can verify that an appropriate version was
installed from the VCS, when the VCS link provides
a version in the egg name.

Related to coala/meta#123

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setup.cfg: Use template

Also use template for tests/conftest.py

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Meta-review.rst: Add meta-review docs

Closes coala#5513

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CacheUtilities.py: Remove unused variables

Closes coala#5642

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.coafile: Modify circleci config file location

This fixes the location and changes it from
circle.yml to ./.circleci/config.yml.

Closes coala#5375

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Bear: Remove debugger from init

Fix the API breakage problem because of
`debugger` flag in bear base class.

Related to coala#5676

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LocalBearTestHelper: Modify for `aspects` testing

This modifies `LocalBearTestHelper` to make it compatible
for testing `aspects` in coala-bears.

Closes coala#5637

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Added __main__.py, so that the package coalib.py
can be started from that file

coalib/__main__.py

@@ -1,3 +1,4 @@
+<<<<<<< HEAD
 # This invokes the main method of coala from the
 # package coalib.
 # This is used when we invoke coala using -m
@@ -9,4 +10,14 @@
 from coalib.coala import main
 
 if __name__ == '__main__':
-    sys.exit(main())
+    sys.exit(main())
+
+=======
+import sys
+
+from coalib.coala import main
+# Stop ignoring
+
+if __name__ == '__main__':
+    sys.exit(main())
+>>>>>>> ec444a7... Added __main__.py, so that the package coalib.py