Ensure user logged in to correct account before generating pages

[ev-codes]

Need to account for (non-exhaustive list):

• delete-segment.php - is user logged into account associated with that episode's program?
• save-segment.php - is user logged into account associated with that episode's program?
• editing a draft - is user logged into account associated with that episode's program?
• review-logsheet.php - is user logged into account associated with that episode's program?
• save-episode.php - is user logged into account associated with program they are trying to save the episode under?

Admin accounts should be able to access or use all of the above pages.

[janescloset]

I added the protection for the pages above.

[ev-codes]

While non-users are not able to perform the functions in the checklist above, the system currently does not ensure that one program account cannot modify another program's log sheet entry as this issue says.