new version of gigi (again: 0.83beta)

[EntropyReduction]

Worst I did was rush out the "refresh cache" option without testing it.
 Or even finishing it.

https://sites.google.com/site/entropyreduction/gigi

-- fixed "refresh cache" in file menu

-- cosmetic changes to channels menu

-- channels menu button now hidden when there's no channels.conf

-- if you pick a channel from the channel menu, it will have '$'
   appended to it when a search occurs, preventing channel names like
   "BBC Radio 4" from including "BBC Radio 4Xtra"

-- changed defaults for first creation of config file: as a result
   Search menu:

     "hide downloaded" is now unchecked
     only tv programmes are searched for (was: only radio)