Since I discovered only recently that I missed one level of logging (namely E_NOTICE) in my PHP development environment, I figured it would be a nice move to try to initialize variables before using them </shame>. Things are already fixed in some places, but it will take some time to spot them all.
Having just installed myself a new OS, I wanted to avoid the installation of MySQL or PostgreSQL while still being able to code on DaPortal. I found it interesting to support a third database backend support, namely SQLite. After a few frustrating steps I could manage to have something useful out of it. I can not pretend it is complete, but it works well enough for a basic setup.