Favicon.ico was an empty file! Add a nice new one, use for roundcube too
Don't need to install php mysql or mysqli modules as already handled by mysqlnd
Install mysql pdo drivers, roundcube needs them

Conflicts:

	install/scripts/10_pkg_add.sh
	install/scripts/32_php.sh
Make location of dovecot configs consistent
Do initial clamav database download in background as it's ofen very slow