addon:DisplayFrame() no longer uses function parameters.

addon:DisplayFrame() no longer uses function parameters.
Removed allSpecTable - it was never used.
Removed sortedRecipeIndex - addon.sorted_recipes is used now.
Renamed dungeonlocationlist to INSTANCE_LOCATIONS.
Renamed SortMissingRecipes() to SortRecipeList() - it now has no return value nor parameter.
Removed the function definitions from sortFuncs, making them their own do-block-local entities.
Pulled the definition of sortFuncs out of SortRecipeList().
Changed some comments, removing those for which their code was obvious.
Altered some syntax throughout.