PhpWiki 1.6.2 released

This is a bug-fix and enhancement release.

PhpWiki 1.6.2 is the last release compatible with PHP 5.
It should work for all PHP releases from 5.3.3 to 8.2.x.
Next release will require at least PHP 7.4.

Fixes
* Make renaming of pages work for DATABASE_TYPE = PDO and file.
* Make WantedPages work for DATABASE_TYPE = dba and file
* Back links now work when the link is inside a table, in a template or in an included page.

Misc
* Add SourceForge Open Source Excellence badge to footer

See ReleaseNotes for the complete list of improvements.