Allow users to edit a report after opening it in read only mode

[mysticfall]

Currently, when user double clicks on a report file in Pentaho BI, it opens the file in read-only mode.

In order to open it in edit mode, a user has to select the 'Edit' menu explicitly which has been quite a source of confusion.

We need to add an edit button which toggles between edit/view mode when the user has proper permission to update the file to mitigate the problem.

Related forum post:

• https://groups.google.com/d/msg/pivot4j-list/87QDhpD0rPk/uvhacgN2le4J