lib-storage: Add mailbox-list-iter-private.h with autocreate context structs Needed for the following ACL change.

lib-storage: Added initial implementation for layout=index. The idea is that all of the mailbox names only exist in the mailbox list index. Storage directories use mailbox GUIDs. This avoids all kinds of race conditions with mailbox renames. mailbox_list_index=yes is required for this layout to work. There are probably still some race conditions within the indexing code itself. Also error recovery is missing.

lib-storage: Moved mailbox-list-iter.c to list/

lib-storage: Added mailbox-list-notify API for tracking changes in all mailboxes. Requires mailbox_list_index=yes to work.

mailbox list indexes: Moved syncing code to separate file.

mailbox list indexes: Moved iteration code to separate file.

Renamed index-mailbox-list* to mailbox-list-index*

lib-storage: Initial commit for rewritten mailbox list indexes code. They're only enabled with mailbox_list_index=yes setting (default is no). They can also get out of sync pretty easily currently.

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

lib-storage: Added "none" mailbox list driver. Fixed the most obvious crashes when using the driver. --HG-- branch : HEAD

lib-storage: Changed mailbox_list.iter_is_mailbox() API. --HG-- branch : HEAD

lib-storage: Mailbox deletion API changed. Mailbox deletion should now be free of race conditions. The actual file deletion code is now responsibility of mailbox_list backend. --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 missing file --HG-- branch : HEAD

Mailbox listing API changed to support more features. Used to implement support for half of LIST-EXTENDED. --HG-- branch : HEAD

Added --with-headers configure option to install .h files. --HG-- branch : HEAD

Mailbox list indexing and related changes. Currently works only with maildir and mmap_disable=no. This allows doing STATUS to synced mailboxes without opening their index files at all. --HG-- branch : HEAD

Forgot to add --HG-- branch : HEAD