This splits --live_instance option so that it is possible to only disable
load/save SQL dumps: --live_instance automatically set --dump_sql=0

Also fix saving static files when --live_instance is used.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@36452 20353a03-c40f-0410-a6d1-a30d3c3de9de