More background tasks and alerting options

Hi all,

I'd like to have more background tasks logged, such as:

- create or rename/delete organisations

- create, delete or rename translation memories

- create or rename Termbases

As there is a reference for project delete, there should be also a reference for project creation (you only get a task ID which is rather useless)

It would be also interesting to have some optional email alerting (like you have for phase changes and assignments etc.) whenever such an event happens and also when a background task fails (e.g. when a TM import task fails).