Merge remote-tracking branch 'origin/prep-release/1.0.6' into prep-re…

…lease/1.0.6

* origin/prep-release/1.0.6:
  [prep-release/1.0.6] Correct version number in install.txt
  [bug/erik/63119] Nested class declaration error
  [feature/phpBB-3.0.11] Change unstable release handeling
  [feature/phpBB-3.0.11] Initial work on phpBB 3.0.11 support

[prep-release/1.0.5] Fix STK login

The `$phpbb_root_path` gets incorrectly rewritten to resolve a potential
invalid link (pointing to phpBB rather than the STK index). As this only
occures on error messages and all other redirects remain in working order
remove this overwritten behavior for now. This issue should be addressed
for the next release but poses no major problems for now.

Increase version numbers for release

[prep-release/1.0.4] Bump the version for RC2

[prep-release/1.0.4] Up the version numbers for RC1

[prep-release/1.0.3] Increase version numbers

[prep-release/1.0.3] Up the version numbers

[prep-release/1.0.3] Up the version numbers

Increment the version numbers to 1.0.3-rc1

Merge branch 'prep-release-1.0.2.1' into stk/olympus

Merge branch 'prep-release-1.0.2.1-pl1' into stk/olympus