optimizing eds calendar - week report

["Stanislav Slusny" <slusnys gmail com>]

Hello,

this is what I done in last two weeks:

- all calendar backends are using interval trees now (not only file
backend - speed optimization)
- I merged my work with subversion
- fixed some bugs

Summer of Code was really exciting, I enjoyed it. Thank you...

Regards

Stanislav Slusny