Close open files on error within SW_netCDF.c

[N1ckP3rsl3y]

• In SOILWAT2 v8.0.0, there is a bug where the two functions - SW_NC_write_output() & SW_NC_read_out_vars() - upon error, the open file does not get closed

• The mentioned two functions now close files upon failure before leaving the function

• See SW_NC_read_out_vars() doesn't close file connection #424 and SW_NC_write_output() doesn't close open files on error #426

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.33%. Comparing base (1605a74) to head (f657982).

Additional details and impacted files

@@                  Coverage Diff                  @@
##           release/devel_v8.1.0     #429   +/-   ##
=====================================================
  Coverage                 73.33%   73.33%           
=====================================================
  Files                        20       20           
  Lines                      6233     6233           
=====================================================
  Hits                       4571     4571           
  Misses                     1662     1662           

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[dschlaep]

Looks great, thanks! All changes to file "SW_Control.c", however, are temporary debugging code that should not be here, please remove.