Adding properties to expose useful information to derived classes, also ...#2

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assarbad wants to merge 2 commits intoryanakca:masterfrom

assarbad:enhancements_plus_additional_properties

Commits on Dec 12, 2014

Adding properties to expose useful information to derived classes, also changed 'file' (a keyword) to 'rcsfile' in the ctor and made self._filename a tuple
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Adding property to expose the file name as a string (or '?' if none is known)
assarbad
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