Numerous changes:
Numerous changes:

* To handle format errors in the input HTML file, raise exceptions instead of directly calling sys.exit().

* Use a subclass of the built-in file type to more easily track the current line number in the input HTML file.

* Revamp the way elevations are parsed and stored internally. This will make it easier to compare elevations with those on other sites, it will make it easier to error-check and gather stats for elevation sources, and it could allow elevations with linked sources to be represented more compactly in JSON.

* Added support for the Nevada Peaks Club list and for peaks for which there are no Bob Burd trip reports.

nightjuggler/peaks,nightjuggler/peaks,nightjuggler/peaks,nightjuggler/peaks