Add Visual Clickable Layer of EPA Permitted Point Sources

[rajadain]

Using the ms_pointsource table, add a visual layer showing the EPA Permitted Point Sources of Pollution:

The layer should be clickable, and clicking on a point-source should have a pop-up that shows the metadata associated with the point source:

SELECT * FROM ms_pointsource LIMIT 5;

 ogc_fid |                        geom                        | npdes_id  |     city     | state |  latitude  |  longitude   |   huc_12_cod    | avg_n_conc |   lbsn_yr   |  mgd   | avgpconc  |     lbsp_yr     |  kgn_yr  | kgp_yr 
---------+----------------------------------------------------+-----------+--------------+-------+------------+--------------+-----------------+------------+-------------+--------+-----------+-----------------+----------+--------
   23070 | 0101000020E610000015C5ABAC6D1454C038A0A52BD8A24340 | WV0005363 | CLARKSBURG   | WV    | 39.2722220 |  -80.3191940 |  50200020204.00 |       21.6 | 50005660.00 | 1100.0 |           |                 | 22702570 |       
   23071 | 0101000020E6100000C425C79DD2D358C06EA6423C12ED4340 | KS0100749 | PHILLIPSBURG | KS    | 39.8521190 |  -99.3097300 |                 |       90.1 | 17474523.00 |   19.2 | 0.0180000 |    1953.0000000 |  7933433 |    887
   23072 | 0101000020E6100000ACADD85F76F155C03E5C72DC29E94440 | IL0028053 | CICERO       | IL    | 41.8215900 |  -87.7728500 |  71200040705.00 |        7.8 | 15774767.00 |  680.0 | 0.9300000 | 1879062.0000000 |  7161744 | 853094
   23073 | 0101000020E6100000E50B5A48C04F5DC0A9DA6E826F564040 | CA0107409 | SAN DIEGO    | CA    | 32.6752780 | -117.2461110 | 181000000000.00 |       37.4 | 14942084.00 |  131.0 |           |                 |  6783706 |       
   23074 | 0101000020E61000004D4BAC8C469857C08FC2F5285C934240 | MO0002402 | CARTHAGE     | MO    | 37.1512500 |  -94.3793060 | 111000000000.00 |       93.0 | 10453958.00 |   11.8 |           |                 |  4746097 |       

Since it is a large number of points for the national dataset, we may have to use the Tiler with a UTF-Grid layer for interactivity. We may also have to look into grouping points at lower zoom levels.