Bug: Reset button in monthly log did not clear “unsaved changes” count

The {\tt countChange()} and {\tt leaveDocument()} functions in the JavaScript code which warn a user about to navigate away from a monthly log page with unsaved changes continued to issue the warning if the user had reversed all the changes with the ``Reset'' button. I added an ``{\tt onclick}'' event handler to the reset button which resets the {\tt unsavedChanges} count to zero.