* Slightly change purpose of some options, so that --load and --save can be combined:
  * --load reuses an existing unit test instance.
  * --save runs in persistent mode. Tests are skipped if --load is unset.
* --data_fs_path just allows to specify a Data.fs path other than the default one. Before this commit, the option was used without --load or --save. To get the previous behaviour, it must be used with --load. Note that it is now possible to use it with --save, what overwrites or modifies it.
* if --load is used and MySQL dump is missing, --recreate_catalog is automatically set.
* Drop now useless 'erp5_force_data_fs' environment variable.
* Import Products and static files in the correct order (= same as a normal instance).
* Enable DeadlockDebugger and start ZServer.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@28043 20353a03-c40f-0410-a6d1-a30d3c3de9de