remove console-specific auto-popup disabling

This PR re-enables auto-popup of autocompletions in the console, and resolves the help position if it would overflow on display (e.g. for the console, or source pane, near the bottom of the window).

![screen shot 2014-11-26 at 7 38 54 pm](https://cloud.githubusercontent.com/assets/1976582/5212076/e7e84c66-75a3-11e4-93d5-ee6606addea9.png)