Changes to inbox task list cause cursor to return to mouse

[mgsloan]

In the currently released version, if the mouse is over the "today" list, edits to the task list like moving tasks or reprioritizing a task causes the task under the mouse to get selected. I tried to work around this in 16fcaa2 , but unfortunately the results aren't great:

Note that the cursor rapidly jumps to the mouse's location and then jumps back to the cursor position. Perhaps it's possible to resolve this, but regardless, I think it's better to remove the code which attempts to use the mouse hover drag handle for cursoring. Instead, the blue bar on the left will be used everywhere, similarly as GMail's UI. This should also make it more likely that bugs like #64 will be noticed.

[mgsloan]

Will also lead to a nicer resolution of #26