Update .gitignore

Update version

Add climate surface file for testing

Created a climate surface file in GEMPAK to allow for testing of the
climate surface file decoder. This also made clear that surface file
types were not being correctly determined in every case. The detection
was modified and should no longer produce erroneous results. Removed
text data as a possible element for merged sounding data per GEMPAK
documentation.

Adds additional testing coverage.

Update README and LICENSE

Add test for multi-time grid

Added a test grid with two date/time values for a grid. Bumped version
number.

Add python 3.11 to testing

Minor bug fixes and new tests

Merge pull request #4 from nawendt/fix-text

Fixed truncated text data on surface and soundings

Fixed sounding decorder bug

Part of the SIGW merging code erroneously added pressure to the wind
direction array. This was subsequently written over by actual wind
direction data which may explain why no errors were found in testing.
The pressure level is not placed in the correct array.