Fixes for create new flag feature
Not sure why this was disabled

Very important to have feedback here, especially with large mailbox
lists and/or a slow connection
Correctly update prefs on login; before changes were being lost since prefs storage was null at this point

Additionally, add 'newmail_notify' to the list of prefs to ignore/lock
when using POP
Don't show drafts option when using POP3

This wasn't implemented for Dynamic view. For other views, switch to
DRAFTS access check (folders can be disabled on an IMAP server, but the
drafts mailbox could be INBOX).