#74: Username and password can now be changed.
#74: Added profile privacy and default task privacy. Now to wire them up so they actually work...
#74: Got profile privacy and default task privacy working.
For #74: set up email alert options and wired them up. Also set up email alerts and corresponding options for friend requests. Closes #71.
Added email alert checkboxes to the options page, and wired those up. Closes #74