Fix type='str' optparse options

See merge request pycqa/flake8!419

Allow the new pycodestyle alpha

See merge request pycqa/flake8!418

Support pyflakes 2.2.x

Closes #625

See merge request pycqa/flake8!417

Docs: Fix typo

See merge request pycqa/flake8!416

docs: Add missing semicolon to term link

See merge request pycqa/flake8!415

instrument coverage on tests and require 100% coverage there

See merge request pycqa/flake8!414

Allow noqa to apply to lines due to continuation

Closes #375

See merge request pycqa/flake8!413

Upgrade pip in gitlab ci without using get-pip.py

See merge request pycqa/flake8!411

config: Determine path to user configuration immediately

See merge request pycqa/flake8!409

Preemptively determine the path of the user configuration file during
the construction of the `ConfigFileFinder` object.  The user
configuration path will always be the same, regardless of when it gets
obtained by a run of `flake8`.

This isolates the logic of determining the user configuration path into
a static helper method to be called to set the `.user_config_file`
attribute.  The helper method leverages `utils.is_windows()`, instead of
reimplementing the check, and decomposes clearly the directory name and
the base name to construct the path with a single `return` path.
Additionally, this avoids reconstructing the path on demand of obtaining
the user configuration file path.

config: Remove checks for configs being previously parsed

See merge request pycqa/flake8!408

Remove the checks to see if a configuration file has already been seen
and parsed.  These checks aren't necessary because the entire run of
`flake8` calls these methods *only* once per configuration provided.

Ensure that a not-found file produces an error

Closes #600

See merge request pycqa/flake8!404

document that contents may appear before/after a noqa comment

Closes #528

See merge request pycqa/flake8!407

split lines the same when read from stdin

Closes #270

See merge request pycqa/flake8!406

Fix the type= warning to contain the option name

See merge request pycqa/flake8!405

- this restores a flake8 2.x behaviour that was lost in the refactor

Some typo fixes in git hooks docs

See merge request pycqa/flake8!403

config: Make ConfigFileFinder 'extra_config_files' parameter optional

See merge request pycqa/flake8!402

This simplifies the number of required parameters needed for the
`ConfigFileFinder` object throughout the various tests.

Determine config file override from the ConfigFileFinder object

See merge request pycqa/flake8!401

Now that `ConfigFileFinder.config_file` attribute is used everywhere and
is constructed from the `--config` CLI option, the now unused
`cli_config` parameters can be safely removed.

Now that the `ConfigFileFinder` has the `.config_file` attribute, switch
the relevant code paths to utilize this public attribute.

Tests have been updated to either construct `ConfigFileFinder` or mock
the object appropriately.

The `--config` flag is passed into `MergedConfigParser.parse()` and the
module-level function `config.get_local_plugins()`.  Since both of these
places utilize the `ConfigFileFinder` object and the configuration file
override pertains to how configuration behaves, this incremental change
directly associates the `ConfigFileFinder` and the configuration file
override.

config: Remove ConfigFileFinder 'parent' and 'tail' attributes

See merge request pycqa/flake8!400

application: Remove stale docstring param for `.find_plugins()`

See merge request pycqa/flake8!399