Returns true, if author
worked on this file.
Returns if the first column contains keys that identify each row
Returns true if at least some local files have matching
entries in local CVS metada directories.
Checks if more lines are available for reading.
Checks if the revision contains numbers for the added
and removed lines.
Creates a bar chart showing a distribution of revisions
over the hours of the day.
TODO: Can we turn this into an abstract base class of MarkupHTML and MarkupXDoc?
Helper class for rendering different types of table cells and table heads
to HTML