Major Problem:
issue when using NFS path value for TMPDIR variable (staf copy loops for ever 
when trying to copy a folder to itself)

What's done: fix the issue and do some cleanup

- set the log directory path in objects (instance,client)
instance.getLogDir()
instance.setLogDir()
client.getLogDir()
client.setLogDir()

- use a function to give the path name of the tmp file (factorize the code) : 
getLogFileName()

- do not copy a directory if the destDirectory already exists (avoid copying 
directory to itself in case of directory is shared by nfs.

- add a new file : parser/object.xml : new library to manage objects
currently one function :
getEnabledClients() : return the list of enabled clients defined in the 
scheduler


---This line, and those below, will be ignored--

M    main_run.xml
M    verdict/verdict.xml
M    installation/installation_opends.xml
M    log/log.xml
M    shared/functions/ldap.xml
M    shared/functions/stafcmd.xml
M    configuration/configuration_opends.xml
M    generateLdif/generateLdif.xml
M    parser/parser.py
M    parser/parser.xml
M    main_run_lib.xml
M    scheduler/scheduler.xml
AM   parser/object_lib.xml