prevent assertion in p_string_erase
Fix IMAP mailbox maintanence Update message's mailbox id in a separate explicit transaction to prevent SQLException: ORA-01453 error on the next db_begin_transaction() call (see db_mailbox_seq_update() next to 'UPDATE dbmail_messages SET mailbox_idnr' query).
fix compiler warnings for GCC5
DBMail is primarily developed and tested on the GNU Linux and FreeBSD platforms. Users have also reported successfull deployments on OpenSolaris, NetBSD and OSX.
DBMail is released under the GNU Public Licence (version 2).