[Dovecot] Making POP3 not retrieve deleted messages

[Aredridel]

Since my users often use the webmail system to delete messages to save
their poor strained dial-up POP3-using mail clients, and our new web
mail system isn't expunge-happy like the last one, I found need for this
patch -- it adds a configuration option for pop3 "pop3_ignore_deleted",
a boolean, that does just that.

I'd love feedback.

Aria
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