Fix cloning behavior (See Bug 1410).

Remove deprecated code in IMAP_Tree::.

Move IMP_IMAPClient:: to Horde.

Merge IMP_Thread:: to IMAP_Thread::.

Encrypt deprecations in Horde_Crypt_pgp::.

Use one place for clear text sendmail error messages.

rename files in imp/templates/prefs to more sensibe defaults (e.g. draftsfolderselect.inc, not folderselect.inc)