Converting from mysql to mysqli api

also converting the mysql_workspaces installer to use the normal store
and upgrade it to workspaces. This reduces the amount code to keep in
sync between installers and upgrade scripts

git-svn-id: https://svn.muze.nl/svn/ariadne-php5/trunk@6629 7882d7ee-46e0-0310-a255-a28a61b628e4
declare properties and visibility

git-svn-id: https://svn.muze.nl/svn/ariadne-php5/trunk@6630 7882d7ee-46e0-0310-a255-a28a61b628e4
declare properties and visibility

git-svn-id: https://svn.muze.nl/svn/ariadne-php5/trunk@6631 7882d7ee-46e0-0310-a255-a28a61b628e4