Some fixes for 2.0.8 (or 2.1.0?):

- installation of translation files under same prefix (I'm not sure it's needed, though - I hope it doesn't break anything)
- make Messages.sh executable
- Switch to DocBook 4.2 for the manual so that meinproc4 can handle it. Last update: 2005 => next step is to update the contents!
- Comment out the line which makes Kst2 hang, I assume Debug::trace is not thread-safe. If someone wants to work around the issue I guess a mutex somewhere could do the trick, but for now we can also leave it like this, especially for the release. With that the user file with >38000 columns (sorghum protein) plots in ca 15s on modest hardware :-)

I'll see if I can get the French translation running, but as far as I'm concerned there's nothing else I absolutely want to do prior to making a release.