JODBasedConverter fails when running on very recent versions of LibreOffice / OpenOffice

The command line args format of soffice have changed from -arg to --arg.
This has side effect such as : soffice startup fails on newer versions if arguments have simple dash see https://bugs.freedesktop.org/show_bug.cgi?id=48341

To fix the issue :

• add a parameter in OOoManagerDescriptor : useGnuStyleLongOptions with a default to false (for backward compat)
• add an automatic fallback : if soffice is no more there 1s after the startup we restart it with the "--" synthax