bugfix: when using more than one standalone worker make sure their /tmp directories do not clash

The worker_temp_directory for standalone workers was set to
/tmp/worker_${USER}.standalone. If two standalone workers were running
on the machine, they could overwrite each other’s files.
The fix include the process ID ($$ in Perl) in the directory name.

* version/1.9:
  Really cleans-up the temp directory if it has been created by a previous worker

Switched to our internal implementation of throw() via Carp::confess. It is also available to Runnables as $self->throw( $msg );

more tweaks: pipeline_name contains rel_with_suffix, EHIVE_USER/EHIVE_PASS are still checked first, schema_version not duplicated

moving Ensembl-specific configuration from HiveGeneric_conf into EnsemblGeneric_conf. Make sure you inherit from the right one!

cosmetic: not sure if we need this module to be around. The only purpose it currently serves is to muddy the waters when it comes to documentation.

removed rearrange() and throw() from AnalysisJobAdaptor by removing the unused CreateNewJob() method