Blender Git Loki

Action actuator default value changed from 0.0 to 1.0. Bookmark renamed to Mark and other small logic tooltip changes

- IPOs and actions start it's frame counting in frame 1, not zero.
- Talked with Ben and we agreed to rename the "bookmark" feature before an official release.
- some English typos.
- removed all period in the end of tooltips for consistency's sake.

* note:
I resisted one more time to the temptation of alphabetical ordering the Sensors and Actuators.

That will be the first thing I would like to do after we are done with 2.49 :)
It really annoys me as a user.