Improved calendar views, many fixes

[Gaspard Bucher]

Hi there,

While migrating legacy applications to Zena 1.0, some had... calendar views. This forced me to finally fix this last commented out file.

The fix ended up being a rewrite of this engine to use RubyLess and the new variable scoping features. On the way, I have also reworked a lot of code related to dates in order to have one of the best timezone support available.

Read more: http://zenadmin.org/798

Some other important fixes: Ajax block edit, <r:input type='id'/>, fulltext search, SQLiss scoping "Job:project", SQLiss date macro "event_at.date = #{date}"

This proves that it's not because 2500+ tests pass that everything is OK...

Cheers !

Gaspard