Installing odb after a libodb-* package prevent odb to work correctly

[Max13]

It's a strange title but let's not focus on that.

odb has an options file in which it's possible to specify odb command line options. When installing some libodb-* packages, it's required to add some command line options to odb to make it find some libs.

These options are written to the odb options file when the corresponding package is installed, but (you'll agree) it's pretty hard to write in a file that doesn't exist write? No need to mention that if you create the file while odb isn't installed, it may be reset.

Suggested solution: _Remember to install odb first when installing a libodb-_ package.*