+ 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