Fixes
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* Remove existing sprites when reading a Sprites11 file to stop memory leak
  * Found and fixed tiny sprite merge issue - could lead to in-memory spritefile corruption - Chris Hughes's issue?
* altered some references to 'folder' and 'storage' and 'saved files'
* Display->large icons - doublesize pins too
* '*' in title text on sticky edit
* sticky no longer grows after save/reload if it has furniture
* Fix sticky savefile corruption: save, then reset changes -> was duplicating stickies!
* Adjust PinSetup output so that -TC becomes -TextColour and -Col becomes -Colour to help MoreDesk
  !!!! note that MoreDesk will die when encountering the new *Backdrop parameters (cachejpeg, outlinetext, blendedtext)
  !!!! need to let Steve Revill know when we have completed Pinboard so he can update the parse string in MoreDesk for the new options
  !!!! MoreDesk bug - parser failure shouldn't bring entire app down?
* stop half size icons vanishing if no sm!appname sprite defined
* fix spacing for dropped filer columns for small icons
* add help text to PinSetup
* Adjust grid/tidy layout
* fix window pin dragging
* Fix selection menu text 'Delete File/app/dir' when multiple objects selected
