Remove extraneous whitespace around equal signs so I'll have less to type in a moment.

Also, this conforms better to PEP 8.
Rewrite the rest of the filters to conform to the new query machinery. Filter out None extents.
Fix a vestigial indent.
Get ext: filters working again.

This just needed a few tweaks to the revised query parser.
Linebreaks are in fact *not* in the DB anymore.
Rewrite LocalNamer to be a string.Formatter.

None of __getitem__, get, __getattr__, nor __getattribute__ are called on a map-like object passed into format(), so this is necessary. Factor out alias_counter() so we can use it from tests.

This makes function:main work in test_basic.
[squash] with "Rewrite the rest of the filters..."
Compensate for clang extents being 1-based.
Fix a user-facing error message.
Tolerate the None extents that come out of left joins.