Barracuda V0.8
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- Access control introduced now, but I'm waiting for comments. 
- I changed my idea about the write-race, so will be solved on another way
without the usual lock mechanism...
-use different postgresql instance. But it needs enhancing postgresql
as well:(

Here, when cleaned up the ideas and the code, I will release the V0.9.

- Code reorganization to ease combined form building to support (at first)
the combination of task and document forms (so adding doc can create the
task in one shot, and adding new doc to an existing task can modify the
task's priority and state, maybe deadline also in one shot).

- Object reparenting (move), copy.
- Usable query options (open tasks, deadlines etc)
- Form checking everywhere with highlighted required fields -> will be V1.0
- History for object manipulation
- More informative error handling for the users
- ... lots more! :)
