URL functions - Create URLs in columns, for EJAM

Could start to use this in server and ejamit(), and already used in table_xls_format()

Usage

url_4table(
  lat,
  lon,
  radius = NULL,
  regid = NULL,
  fips,
  wherestr = "",
  namestr = NULL,
  shapefile = NULL,
  as_html = TRUE,
  ...
)

lat: vector of latitudes
lon: vector of longitudes
radius: vector of values for radius in miles
regid: optional vector of FRS registry IDs if available to use to create links to detailed ECHO facility reports
fips: vector of FIPS codes if relevant, to use instead of lat lon, Passed to url_ejscreen_report() as areaid Note that nearly half of all county fips codes are impossible to distinguish from 5-digit zipcodes because the same numbers are used for both purposes.
wherestr: optional because inferred from fips if provided. Passed to url_ejscreenmap() and can be name of city, county, state like from fips2name(201090), or "new rochelle, ny" or "AK" or even a zip code, but NOT a fips code! (for FIPS, use the fips parameter instead). Note that nearly half of all county fips codes are impossible to distinguish from 5-digit zipcodes because the same numbers are used for both purposes.
namestr: passed to url_ejscreen_report()
shapefile: not implemented
as_html: logical, optional. passed to url_ejscreen_report() and url_ejscreenmap()
...: passed to url_ejscreen_report() such as areaid="0201090" for a city fips

list of data.frames to append to the list of data.frames created by ejamit() or doaggregate(),

list(results_bysite = results_bysite, results_overall = results_overall, newcolnames=newcolnames)