Replace OOo Deamon

OOoDeamon causes problem for 2 reasons :

• Communicating with Ooo via pipes involves dependencies on JNI libs
• sometimes there seems to be a deadlock on OOoDaemon

After trying to fix, this seems to still be a mess.

The right solution would probably be to remove Ooo Deamon and upgrade to JODConverter 3 that now includes a OOo instnace manager.
=> http://code.google.com/p/jodconverter/wiki/WhatsNewInVersion3

But this would require some more testing :

• JODConv 3 is still in beta
• last quick integration ended up with OOo Daemon

=> For now we can simply add a helper that starts OpenOffice via command line if needed
==> no pooling management