For your information, I just went through the process of fully re-installing WordPress for www.roumazeilles.net
I tried my best to make sure that everything is correctly restored, but I may have failed. Feel free to contact me to point me to such failures if you witness them.
Thanks for your patience.
Actually, I re-installed the most recent WordPress version, copied back the original configuration, re-installed the minimal plugins, the basic theme and applied chmod to all the directories needing it…