This class implements the source file management behavior of traditional Squeak, with a sources file and a changes file. File positions are mapped such that those files can be up to 32MBytes in size.

Structure:
files Array -- storing the actual source files

	initialize-release
	initialize initialize:

	sourcePointer conversion
	fileIndexFromSourcePointer: filePositionFromSourcePointer: sourcePointerFromFileIndex:andPosition:

	accessing	top
	at: Primitive. Assumes receiver is indexable. Answer the value of an indexable element in the receiver. Fail if the argument index is not an Integer or is out of bounds. Essential. See Object documentation whatIsAPrimitive.
	at:put: Primitive. Assumes receiver is indexable. Store the argument value in the indexable element of the receiver indicated by index. Fail if the index is not an Integer or is out of bounds. Or fail if the value is not of the right type for this kind of collection. Answer the value that was stored. Essential. See Object documentation whatIsAPrimitive.
	size Answer how many elements the receiver contains.

	initialize-release	top
	initialize
	initialize:

	sourcePointer conversion	top
	fileIndexFromSourcePointer: Return the index of the source file which contains the source chunk addressed by anInteger
	filePositionFromSourcePointer: Return the position of the source chunk addressed by anInteger
	sourcePointerFromFileIndex:andPosition: Return a source pointer according to the new 32M algorithm

	initialize-release	top
	install Replace SourceFiles by an instance of me with the standard sources and changes files. This only works if SourceFiles is either an Array or an instance of this class
	new: Answer an instance of this class with the number of indexable variables specified by the argument, sizeRequested.