v4.90: compatible with GMail again

[superflexible]

Hello,

version 4.90 is now available. Due to recent changes with the GMail SMTP server, this update became necessary so that email notifications can be sent via GMail.

Other improvements include:
- profile runner processes will no longer retry failed daily digest notifications indefinitely
- improvement with real time file renames (on Windows)
- if statistics comparison detects any difference, it will trigger an error result and email
- fixes a WebDAV problem where an empty folder could not be deleted
- fixes a possible double processing of shutdown jobs
- fixes folder exclusions in real-time mode
- you can now enter two "after" command lines, separated with :: (space :: space)
- can now use volume label in folder for deleted files

These improvements will be included in the next v5 update as well.