Fixes:
- email_lib: avoid splitting UTF-8 code units across lines
- imap: avoid emitting NIL for body-fld-lines
Enhancements:
- php_mapi: expose default+anonymous ACEs to PHP programs
- zcore: expose new PR_EC_ENABLED_FEATURES_L property
- ews: implement updating folder permissions
- eml2mt: emit a hint if an Outlook .msg file is erroneously passed to eml2mt
Changes:
- exch: start ICS Change Numbers at 0 rather than 2^47 (new mailboxes only)
- PR_MAILBOX_OWNER_ENTRYID is generated for public stores
- exmdb database layer remodeled to support concurrent reads per mailbox in the future