correct axis label in reference data

When data are saved by Device/InputOutput/OutputDataReadWriteINT, axis labels are replaced by "axis0", "axis1". This replacement should be removed for good: internal axis labels should appear unchanged in the ".int.gz" files.

TODO:

Improve Device/InputOutput/DataFormatUtils.cpp so that labels can be read even if they contain blanks.
Remove the label replacement from Device/InputOutput/OutputDataReadWriteINT.
Renew all .int.gz reference data.
Remove method IAxis::setName, no longer needed.

Edited Apr 03, 2022 by Joachim Wuttke