Fixed #23631 -- Removed outdated note on MySQL timezone support.

Thanks marfire for the report.
Added my bio to team docs.
Fixed a tuple/int comparison in spatialite backend

On Python 3, comparing tuple with int raises a TypeError.
Fixed two more tuple/int comparisons in gis tests

Refs 63ff417746.
Fixed #23468 -- Checks for settings.FIXTURE_DIRS

If there are duplications or default fixture paths
for applications (app/fixture) in settings.FIXTURE_DIRS,
checks will return Warning