Overhauled the application to reflect functional changes to the program, and

fix inconsistencies between the documentation and the code.  The program now
operates without regard for point type, and properly honors all OVERWRITE
options in all situations, which fixes #230.  A fourth option has been added,
OVERWRITEMISSING, which will remove measures that do not appear in newer
networks being added to the base, which fixes #228.  The log file has been
revamped to print out a PVL report for each network, and each conflicting point
or measure.  Every conflict will be reported along with a reason (based on user
parameter options) for the ultimate resolution.  This is in reference to issue
#229, but more logging will need to be done in order to warn the user of
potential pitfalls in their selected options.


git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@2838 41f8697f-d340-4b68-9986-7bafba869bb8