[Qgis-developer] Virtual Fields - Allow adding fields out of edit mode

[Matthias Kuhn]

Hi all,

The changes have been merged to master today.

  * Virtual fields are now defined from the field calculator.
  * The field calculator is always available, regardless of provider 
support and edit mode.
  * If an action from the field calculator requires to turn edit mode 
on, the user will be notified on the field calculator dialog that this 
will happen automatically when clicking ok.

Please test this and open issue reports if things are not working as 
expected. Thank you very much.

Matthias