Merge pull request #2058 from Oldiesmann/release-2.1

! Installing SMF on PostgreSQL failed due to copy-and-paste from MySQL...
Merge pull request #2059 from Oldiesmann/release-2.1

! A few more PostgreSQL fixes
Merge pull request #2060 from Oldiesmann/release-2.1

! Fix a couple remaining issues with PostgreSQL
Merge pull request #2062 from Oldiesmann/release-2.1

! Anti-spam questions might not work properly with UTF-8 languages (fixe...
Merge pull request #2063 from Oldiesmann/release-2.1

! Missing global variable
Merge pull request #2065 from Oldiesmann/release-2.1

! Unwatched topics was broken, at least on PostgreSQL (fixes #1373)