Updated .mailmap and CREDITS files
Whitespace fixes
Fix usage of tag_get_all for DBs not using Assoc fetch mode

This is a regression caused by implementation of issue #13446 (see
commit be3dde781523d4ecf11664eff0e6ec050993e044), which used a foreach
to iterate throught the ADOdb recordset returned by tag_get_all(),
instead of using MantisBT's db_fetch_array() function which takes care
of row association for DBs not supporting it natively.

Fixes #16340