Represents a tile script of uniclass. Holds the ScriptEditorMorph structures for the current version of a user-defined tile script, as well as previous versions thereof.

In addition to the instance variables of my superclass, my instance variables are:

currentScriptEditor The current version of the ScriptEditorMorph for the script
formerScriptingTiles A collection of pairs, (<timeStamp> (list of morphs))
each pair characterizing a prior tile version
isTextuallyCoded A boolean. If true, then a hand-crafted user coding supersedes
the tale of the tiles. This architecture is in transition, perhaps.

	script editor
	bringUpToDate currentScriptEditor: instantiatedScriptEditorForPlayer: recompileScriptFromTilesUnlessTextuallyCoded releaseCachedState

	textually coded
	becomeTextuallyCoded isTextuallyCoded okayToRename

	versions
	recreateScriptFrom: revertScriptVersionFrom: revertToLastSavedTileVersionFor: saveScriptVersion: savedTileVersionsCount

	initialization	top
	convertFromUserScript: The argument represents an old UserScript object. convert it over
	initialize Initialize the receiver by setting its inst vars to default values

	script editor	top
	bringUpToDate Bring all versions of the receiver's tile-script source up to date
	currentScriptEditor: Set the receiver's currentScriptEditor as indicated
	instantiatedScriptEditorForPlayer: Return the current script editor, creating it if necessary
	recompileScriptFromTilesUnlessTextuallyCoded recompile Script From Tiles Unless Textually Coded
	releaseCachedState release all non-showing scriptors. What do we do about versions????

	textually coded	top
	becomeTextuallyCoded Transform the receiver into one which is textually coded
	isTextuallyCoded Answer whether the receiver is textually coded
	okayToRename Answer whether the receiver is in a state to be renamed.

	versions	top
	recreateScriptFrom: Used to revert to old tiles
	revertScriptVersionFrom: Let user choose which prior tile version to revert to, and revert to it
	revertToLastSavedTileVersionFor: revert to the last saved tile version
	saveScriptVersion: Save the tile script version by appending a pair of the form <time stamp> <morph list> to my list of former scripting tiles. The morph-list will get copied back into the Scriptor following restoration. Only applies to classic tiles.
	savedTileVersionsCount Answer the number of saved tile versions of the script