Add location tool

[dchassin]

Syntax: gridlabd location [OPTIONS ...] [FILENAME=KEY[:VALUE][,...] ...]

Options:

• --debug: enable debug traceback on exception

• --find[=KEY[:VALUE][,...]]: get location settings

• `--format=FORMAT[,OPTION[:VALUE[,...]]]

• --quiet: suppress error messages

• --silent: suppress all error messages

• --system[=KEY[:VALUE][,...]]: get/set the default location

• --verbose: enable verbose output, if any

• --warning: suppress warning messages

Description:

The location tool allows configuration of the location of a model.

The location tool --system option is used to setup the system's default
location for models when not location data is not specified in the model.
When values are change, the location data is returned and the new location
is stored in `GLD_ETC/location_config.glm

The location tool --find options can identify the current location of a
system or a location based on partial information.

Location setting on FILENAME will be performed in place, i.e., the file will
first be read and the it will be written with the new values. The result
output to stdout will be the previous values.

The keys and globals handled by the location tools include the following:

• latitude: the location's latitude

• longitude: the location's longitude

• number: the location's street number, if any

• street: the location's street name

• zipcode: the location's postal code

• city: the location's city

• county: the location's county

• state: the location's state

• region: the location's region

• country: the location's country

Examples:

Get the current location

gridlabd location --find

Display the default location

gridlabd location --system

Set the location in a model file

gridlabd location ieee123.json=country:US,state:CA,county:Kern,city:Bakersfield