Afew

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MailMover: many fixes

Previously, MailMover didn't properly preserve flags when renaming files, and
moved all mail to `cur`. This was fixed. Also, MailMover gained a test suite.

New filters: PropagateTags[ByRegex]InThreadFilter

These filters allow propagating tags set to a message to the whole thread.

New command line argument: --notmuch-args= in move mode

In move mode, afew calls `notmuch new` after moving mails around. This
prevents `afew -m` from being used in a pre-new hook in `notmuch`.

Now it's possible to specify notmuch args, so something like `afew -m
--notmuch-args=--no-hooks` can live happily in a pre-new hook.

Python 3.4 and 3.5 support dropped

afew stopped supporting the older python versions 3.4 and 3.5, and removed
some more Python 2 compatibility code. (`from __future__ import …`, utf-8
headers, relative imports, …)

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Python 2 support removed

afew doesn't support Python 2 anymore, and all Python 2 specific compat hacks
were removed.

Better support for whitespaces and quotes in folder names

Previously, afew failed with folders containing quotes or namespaces. These
are now properly escaped internally.

Support `MAILDIR` as fallback for database location

In addition to reading notmuch databse location from notmuch config, afew now
supports reading from the `MAILDIR` environment variable, like notmuch CLI
does, too.

Support relative path for database location

As of notmuch 0.28, a relative path may be provided for the database
location. notmuch prepends `$HOME/` to the relative path. For feature
parity, afew now supports the same methodology of prepending `$HOME/` if a
relative path is provided.

Support for removing unread and read tags in filters

In a filter rule, it was possible to add "unread" and "read" tags but
not to remove them.

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MeFilter added

Add filter tagging mail sent directly to any of addresses defined in
Notmuch config file: `primary_email` or `other_email`.
Default tag is `to-me` and can be customized with `me_tag` option.

License comments replaced with SPDX-License-Identifier

Where possible, license boilerplate comments were changed to just the
SPDX-License-Identifier, while adding the license to the repo and referencing
it in `setup.py`, too.

DMARCReportInspectionFilter added

DMARC reports usually come in ZIP files. To check the report you have to
unpack and search thru XML document which is very tedious. The filter tags the
message as follows:

if there's any SPF failure in any attachment, tag the message with
"dmarc-spf-fail" tag, otherwise tag with "dmarc-spf-ok"

if there's any DKIM failure in any attachment, tag the message with
"dmarc-dkim-fail" tag, otherwise tag with "dmarc-dkim-ok"

DKIMValidityFilter added
This filter verifies DKIM signatures of E-Mails with DKIM header, and adds
`dkin-ok` or `dkin-fail` tags.

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FolderNameFilter supporting mails in multiple directories

FolderNameFilter now looks at all folders that a message is in when adding
tags to it.

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Classification system removed

As of commit 86d881d948c6ff00a6475dee97551ea092e526a1, the classification
system (--learn) was removed, as it was really broken. If someone wants to
implement it properly in the future it would be much simpler to start from
scratch.

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Filter behaviour change

As of commit d98a0cd0d1f37ee64d03be75e75556cff9f32c29, the ListMailsFilter
does not add a tag named `list-id `anymore, but a new one called
`lists/<list-id>`.