Geomagpy

+ IYFV files can be exported even if less than 90% of data is available for one year
+ IYFV files with less then 90% data are listed with incomplete flag (if not quiet or disturbed days)
+ resample method: improved recognition of nan values in source data (speed and accuracy)
+ analysis of single DI file now possible
+ fixed baseline correction method for non-quasi-absolute HEZ variometer data in DI-flux measurements

+ definitive data check has been corrected and updated (full analysis)
+ IAF export will not abort in case of meta data issues
+ IAF export will not modify the original data header for further use
+ ImagCDF import and export now supports F AND temperature columns of different lengths
+ Filtering of HF signals (> 50 Hz) working

+ corrected simple baseline adoption function (simplebaseline)
+ updated backend tests to select appropriate matplotlib backends

+ IMPORTANT: corrected baseline adoption function (bc)
correction of of hdz data previously used x component instead of h

- python3 fix for POS1 instrument - serial init
- fixed abort of file_upload when memory file is emtpy
- python3 fix for Env05 Environmental sensors