Bugfixes and ctrl+enter from search box for tasks

Renamed delete button to trash.
Hide Topic/Project result header if empty.
Revised syntax cheatsheet.
Added ctrl+enter feature to search box: added a new task without
checking for the dash ('- ')
Use jquery.hotkeys for search box too.
Fixed: bug when inserting tasks from search box.  Refactored function.
Fixed: bug when search term is found in projects also.
Other minor code fixes, etc...