High continuity error, critical elements, and flow instability tables display

[MitchHeineman]

The Highest Continuity Errors, Time-Step Critical Elements, and Highest Flow Instability Index tables are presently printed in the .RPT file after the flow continuity error with the top five locations. For a large model with convergence/stability issues, the modeler would prefer to see a more comprehensive list.

It would be simple to change MAX_STATS in stats.c to a user-specified variable via the [OPTIONS] section.

Alternatively or additionally, these listings could be appended to the Link Flow and Node Inflow summary tables.

These changes would assist users in debugging convergence and timestep issues in complex models.

[dickinsonre]

Another suggestion is to show the magnitude of the node continuity error. The percent error is often misleading for tiny flows.

[cbuahin]

I prefer adding to the link flow and node summary tables will work on adding it as it is more straightforward to implement.