CALANLS version 6.31, level 080417

- Purpose: Rank concentrations for the given averaging time on the length of the period provided.

- The ranking key group is the all|_source concentration file.

- The list of receptor can be read from two types of format.
	-case 1 - generic format X, Y, receptor_ID
	-case 0 - CALPOST output file in the Rank external file format type for the averaging period to be analyzed. 
              It should include all sources concentrations + ambient background and averaged on same averaging period
              we are looking at in CALANALYSIS. 
              (Example: including all receptors to be analyzed with highest 3h-averaged concentrations)
                               
In case 1- All receptors listed will be processed, but only the dates with total (all_sources + ambient background) 
           concentration above the NAAQS or PSD standard (Threshold 1) will be output

In case 0- Out of all receptors listed only receptors with concentrations in third column of file above the 
           NAAQS or PSD standard (Threshold 1) will be processed and only the dates with total (all_sources + ambient background) 
           concentration above the NAAQS or PSD standard (Threshold 1) will be output


- Only concentrations files with hourly (3600 sec) time steps or larger can be performed at the moment.

Note the concentrations in CALPUFF files are recorded in g/m3, the scaling factor 1000000 is used to have output in ug/m3 
(not appearing in the GUI)

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Additional analysis is also performed to find what is the highest total concentration 
when a selected group source is larger than a second threshold (for example the Significant Impact levels (SILs))
if you want this extra analyse, select 1 to the question 'more analysis?' (not a choice for GUI, always performed)
The 2nd threshold value is called 2nd threshold or SIL (in GUI).

In this option, you can choose to include or exclude the Rank 1 at each receptor.  
For example, for a PSD cumulative analysis, Rank 1 can be excluded.

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Not in GUI:
There is also a choice to output a file for each receptors with a total concentration larger than the first threshold 
with dataset sorted by julian day for the whole period processed.
This choice is selected if the response to the question: Do you want the time series? is 1.
0 means no extra files will be generated for each receptor.