SusiMail:
   - Increase max size of mails that are fetched in full,
     previous limit was so small it never happened.
   - Move page nav to top of folder view, hide if only one page
   - Put message nav buttons on second line
   - Refuse to send mail with no "to"
   - Reduce default page size as it slows startup
   - Remove unnecessary casts
   - Right justify some input fields