Prior to this, if a user reported an issue and then their access level
was downgraded to "viewer", they would no longer be able to add bugnotes
to the issue. However, config option $g_allow_reporter_reopen would
still let them reopen it, and likewise for $g_allow_reporter_upload to
attach files and $g_allow_reporter_close.

Fixes #11782

The code did not properly reflect the configuration state when building
the Access Levels form, if the minimum access level was defined using
update_bug_status_threshold and set_status_threshold wass empty, showing
'viewer' for each status except 'new'.

Consequently, saving the page without changes would cause the config to
be saved with all access levels as 'viewer'.

Fixes #14496

- Avoid code duplication with a function set_color_override to determine
  override of cells bgcolors attribute
- Use a single loop over the status enum in access_row()
- Removed unnecessary assignments and useless code

The code in manage_config_workflow_set.php now deletes the config
override for the current project if the new settings are identical to
the parent's (ALL_PROJECTS level if project, or file-level if all
projects).

Follow-up fix for issue #14496

This prevents incorrect highlighting of NEW status as an override in the
Access Levels section of manage_config_workflow_page.php, when
$g_bug_submit_status is different from default.

Fixes #14496 (see atrol's bugnote ~33192 and my follow up in ~33325)

This allows to coalesce commits by the same person in the git shortlog,
where their name and/or email address was spelled differently.

The git shortlog can then be used to populate the CREDITS file's
"Contributors" section

With the addition of .mailmap file, the "Contributors" section can now
be easily updated with the output of the following command:

git shortlog -s -n |cut -f2

This can be achieved automatically by running the 'update-credits.sh'
script (in the mantisbt-tools repository).