New features :

- Implements smart zoom processing over the secondary axis : delimiter range
is now automatically adapted to the current zoom level : available range are
day, week, month, 6months, year. (hours, 6hours, 12hours coming soon).
- Implements Tooltip over the secondary axis : full group informations is
display when the cursor is left over
- Fix block start & stop bounds. Values are now rounded to the closest entire
day
- Improved validator : in case of non validation blocs that causes problem are
displayed in another color (strong pink), their activity in light pink (in case
several blocks are needed to represent the activity).
- Improved validator : in case of non validation all blocks are removed to their
previous position. This prevents the user from having to move again all the blocs
when one of them was wrongly placed



git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@7124 20353a03-c40f-0410-a6d1-a30d3c3de9de