Encapsulates a revision of a file in the virtual drive
gets the comment field
getter for the date and time the file was modified to this revision
sets the head revision number - the most recent CVS revision number for this file
getter of the username of the user who submitted this revision.
the name of the user who submitted this revision.
sets the comment field
setter for the date and time the file was revised
sets the revision number (code) of this revision
sets the username of the user who submitted this revision.
Parameters: userName - the userName of the user who submitted thisrevision