Gromox 2.27

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