[ticket/13193] Add link to post count in PMs

PHPBB3-13193
[ticket/13193] Add load_search config check

PHPBB3-13193
[ticket/13193] Make template more readable

PHPBB3-13193
[ticket/13193] Swap ternary condition members

PHPBB3-13193
Merge pull request #3054 from Senky/ticket/13193

[ticket/13193] Post count in PMs not a link

* Senky/ticket/13193:
  [ticket/13193] Swap ternary condition members
  [ticket/13193] Make template more readable
  [ticket/13193] Add load_search config check
  [ticket/13193] Add link to post count in PMs
[ticket/13221] Perform bot updates after user table changes

PHPBB3-13221
[ticket/13221] Add bot_update as a dependency to gold

PHPBB3-13221
Merge branch 'prep-release-3.1.0' into develop-ascraeus

* prep-release-3.1.0:
  [ticket/13221] Add bot_update as a dependency to gold
  [ticket/13221] Perform bot updates after user table changes
[ticket/13223] Fix USERNAME email template variable in notification

admin_activate_user.php notification type is assigning usernames to email
template variables using user_loader->get_username() in 'no_profile' mode,
which in its turn calls get_username_string() function in 'no_profile' mode.
This causes HTML markup in emails for username colour.

PHPBB3-13223
Merge branch 'prep-release-3.1.0' into develop-ascraeus

* prep-release-3.1.0:
  [ticket/13223] Fix USERNAME email template variable in notification
[prep-release-3.1.0] Update CHANGELOG with last minute changes
Merge branch 'prep-release-3.1.0' into develop-ascraeus

* prep-release-3.1.0:
  [prep-release-3.1.0] Update CHANGELOG with last minute changes