[Release] Questions and remarks

Hi all, I have many questions and remarks: 1. I have exploited the XWiki version 0.9.840, so I developed much functionality but when I decided to upgrade to the version 0.9.1252 the XWiki not work, it seems that the database schema is not the same for both version, is it right? If yes, how to upgrade to the new version using old database? 2. When installing the version 0.9.1252 it seems that we can not change the name of the directory. The directory must be 'xwiki'! But with the version 0.9.840 whatsoever the directory it work perfectly. 3. This is very important to check...So when we use Google (to find) for downloading xwiki it seems there are many and not updated web sites... So the new user is often (I think) confused, (e.g http://sourceforge.net/projects/xwiki/, http://www.xwiki.org/xwiki/bin/view/Download/Download and http://forge.objectweb.org/projects/xwiki/) 4. I would like to know, why you have decided to use HSQL? Do you think that it is more sufficient than MySql databases? How to administrate HSQL database visually like MySql administrator? How to convert HSQL database to MySql database? 5. Where can I find the news functionalities about new release (API, etc)? This is an important thing; I think it is preferable to add a text file (readme.txt) in the WAR file or exe installer...where user can have a quick idea about new functionalities... I am willing also to participate for writing complete documentation, tutorial etc (4-6 hours/week). Are there any work done before to produce fully documentation with examples and steps by step tutorials for learning xwiki? Any ideas about my questions will be strongly appreciated. Youcef