Leginon

fixed both warning message about missing argument and missing first array in array_diff_keys. The former is fixed with a default empty string. The function might not need the argument any more but I will leave it as is until I work on admin_settings.php later.

The latter came from our dbemdata not having BeamTiltImagerSettingsData defined for administrator user.  Catch the exception and display warning messages.  This makes me realize the upgrading users need a way to revert to original default, a feature lost in this version. so I added it back in.

r14302 in trunk
merged this and #640 changes to commit r14304 in the branch

Eric can test.

Testing:
1. Use an older test dbemdata (before Jun 7) or Scott's upgraded database.
2. Go to myamiweb/revertsettings.php
3. Choose a test user and revert his/her settings to default
4. You should get some print out of which settings tables are missing, not php error.
5. Click on Revert Settings icon on the left to reset the page.
6. Click on "Revert to Original" 
7. It should say that it is successful.
8. repeat 2 and 3.  This time there should not be missing administrator tables because you have set it to the installation original in step 5 to 7.

tested are good.

Eric