Avoid issues when grep results are too long
Fixes for Yi support
Allow GHCi mode to be enabled/disabled in menu.

When the tool bar is hidden it is a pain to have to switch it on to
exit GHCi mode.
Improve output pane.  Adds URI entry box.

If you select a URI (or click on a link) the new URI becomes
the autoURI and will be refreshed after each build or debug command
exec.