JobId should be displayed in the job output directory

[GoogleCodeExporter]

WMSX puts the files containing the StdOut?+StdErr? of the preexec, the job, 
the postexec and the chain script into a generated directory. It would be 
helpful if also the correspondig job identifier would also be available in a 
file in that directory. E.g. can be called 'jobid'.

This shall be useful, becuse it may happen that a given job needs to be 
cancelled, e.g. because a job chain needs to be interrupted, but the user 
does not want to kill the wmsx-provider (as other chains may be running 
successfully in parallel). With the present setup, the user has to 
disentangle the actual job id from the wmsx log file and the submission 
dates. This is not comfortable.

Original issue reported on code.google.com by berger....@gmail.com on 16 Dec 2009 at 12:47