Optimize physical mail size calculation by using the next message's offset or the mbox size for the last message. --HG-- branch : HEAD

Changed .h ifdef/defines to use <NAME>_H format. --HG-- branch : HEAD

Added "bool" type and changed all ints that were used as booleans to bool. --HG-- branch : HEAD

Moved mbox/maildir-specific variables from struct index_mailbox to mbox_mailbox and maildir_mailbox. --HG-- branch : HEAD

Added mbox_dirty_syncs setting which delays re-reading the whole mbox when it's changed. --HG-- branch : HEAD

mbox code compiles again, but syncing is only partially implemented so accessing mboxes fails.. Also some cleanups to index-storage and maildir code. --HG-- branch : HEAD