Erin (Josh) Rigler authored 6 years ago and Claycomb, Abram Earl committed 6 years ago

- allow adjusted and provisional strings in --type controller argument
- allow adjusted, provisional, and definitive strings in _get_url() in TimeseriesFactory
- return appropriate abbreviation for adjusted/provisional data type
- translate adjuste/prvisional to A0 location code in EdgeFactory
- only write out DECBAS for variation/reported data types
- translate adjusted/provisional to A0 location code in IMFJSONWriter.py
- in several places I set it up so that 'variation' and 'reported' were synonymous,
  although I am not sure I found every such instance.

Also update the maximum channel length to 4 in IAGA2002Writer to
allow for the use of 'DIST' as a channel.

Fixes #186
Changing IAGA output value format to follow the standard.

Moved create_empty_channel to Util module. Changed empty channel from - to NUL. Expanded channel definition

Added ability to except 3 character channels, and to automatically pad out to 4 channels,  if less then 4 channels are present.