Added user reference to AccessLog

[Ou7law007]

This helps identify the logs and trace them to a given user.

Note that the existing username field is modifiable, meaning if changed, the AccessLog can't be traced back to any user.

The username is in AccessBase anyway and not in AccessLog which must be tied to a user.

If there is any chance of this being merged, I'll work further on it, since this will most likely break all previous versions.

AccessLog having a reference to User simply makes sense.

I don't think it's even possible to have a useful AccessLog without an existing User model.

[Ou7law007]

It's possible to make the user null=True, blank=True, but again it makes sense that every AccessLog must have a user reference with on_delete CASCADE.

The files test_management.py and test_handlers.py would need to be modified. The rest seems fine.

All previous versions would break due to 0009_accesslog_user.py's field=models.ForeignKey(...) not providing a default value.

[codecov]

Codecov Report

Merging #1122 (6ef226e) into master (e781d67) will decrease coverage by 1.53%.
Report is 5 commits behind head on master.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1122      +/-   ##
==========================================
- Coverage   94.63%   93.10%   -1.53%     
==========================================
  Files          34       35       +1     
  Lines        1137     1146       +9     
  Branches      209      209              
==========================================
- Hits         1076     1067       -9     
- Misses         47       65      +18     
  Partials       14       14              

Files	Coverage Δ
axes/admin.py	100.00% <100.00%> (ø)
axes/handlers/database.py	94.06% <ø> (-5.94%)	⬇️
axes/migrations/0009_accesslog_user.py	100.00% <100.00%> (ø)
axes/models.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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