Support for many more observed properties

This version has added support for many more observed properties.  All the previous versions had support for only sea_water_salinity and sea_water_temperature.

I have added a new file cf_lookup.pl which is required by the oostethys_sos script and should be installed in the same directory as the script.

To make use of this version two files must be edited:

1) sos_config.xml - You must duplicate the <ObservationList><Observation> section for an existing observed Property for each additional observedProperty on that platform.  You must change the <observedProperty> element to reflect the local name of your observed property.  Note: if locally you refer to sea_water_temperature as seatemperature, seatemperature is the value you should use.  You should also update the <z> element to reflect the depth at which the property is measured.

2) cf_lookup.pl - There is a much expanded lookup table at the very top of the script called @cf_lookup.  This file must be edited to reflect the names you use for your observedProperties / data types.
 
The table is an array of hashes, each hash with the following structure:

 {
    local_name => 'AIR_TEMPERATURE',
    cf_name => 'air_temperature',
    catalog_name => 'AirTemperature',
    label => 'Air Temperature',
    short_name => 'airTemperature',
    definition => 'http://marinemetadata.org/cf#air_temperature',
    units => 'C',
    uom => 'urn:mm.def:units#celsius',
},

The default local_names are the values used by GoMOOS. If you use different local names you must change the local_name in the table and it MUST match the observedProperty elements used in your sos_config.xml file.
In addition if you are serving your observations utilizing different units you should edit the units and uom values.

As an example: If your local name for air temperature is AirTemperature and your observations are measured in Kelvins the entry would look like:

 {
                local_name => 'AirTemperature',
                cf_name => 'air_temperature',
                catalog_name => 'AirTemperature',
                label => 'Air Temperature',
                short_name => 'airTemperature',
                definition => 'http://marinemetadata.org/cf#air_temperature',
                units => 'K',
                uom => 'urn:mm.def:units#kelvin',
        },

Important note:  The cf_name must match the part of the definition after the # symbol.

There are additional comments in the cf_lookup.pl to assist in editing it.