added help dialog for profile
Revert "changed !==null to typeof undefined (missed this one)"

This reverts commit c172bcfebfd8faf99cc68afe7bcd319d93abd330.
- Change colors of hover and selected row for better visibility
- Unselect row when display is updated
- Moved sorting to blur event of days cell. Temperature cell now has a blur again (just updateDisplay)
Added help for empty temperature cells in profile. Fixed missing semicolon.