A ChangeRecord represents a change recorded on a file in fileOut format.
It includes a type (more needs to be done here), and additional information
for certain types such as method defs which need class and category.

	initialization
	class:category:method:sourceFiles: file:position:type: file:position:type:class:category:meta:stamp: fileIn

	access	top
	category
	fileOutOn:
	headerFor:
	isMetaClassChange
	methodClass
	methodClassName
	methodSelector
	readStamp Get the time stamp of this method off the file
	stamp
	stamp:
	string
	text
	type

	initialization	top
	class:category:method:sourceFiles: This should be enough to find all the information for a method, or method deletion
	file:position:type:
	file:position:type:class:category:meta:stamp:
	fileIn