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Fix permission dialog too narrow
- add .orbeon to increase precedence
Different read and update permissions, close #806
- permissions dialog
  - separate read and update in the dialog (total 4 checkboxes)
  - update resources for checkboxes
  - new constraint: if update is selected, read must be selected as well
    - select read when update is selected
    - make read read-only when update is selected
- pages access control
  - detail page (no change)
    - require the `update` permission to access the `edit` page
    - require the `read` permission to access the `view` page
    - if only `read` (no `update`), no `edit` button
  - home page: no change
  - summary, if only `read` (no `update`)
    - link to `view` page (no change)