configure: Removed --enable-header-install. It's now always enabled. There didn't seem to be much point in keeping it optional anymore. They're now more useful than before because shared libraries are also installed. --HG-- branch : HEAD

index-storage: Simplified the way transactions are are created/finished. Removed also mail_storage.class_init/deinit since they're no longer used for anything. --HG-- branch : HEAD

Flattened header namespace on install. --HG-- branch : HEAD

Build libdovecot.so and libdovecot-storage.so. Based on patch by Stephan Bosch. --HG-- branch : HEAD

Added raw storage for opening single-mail files/streams as mailboxes. --HG-- branch : HEAD