Saving labels to file from a trx.mat file does not mark the manual editions with the "edited" label

trx.mat files contain labelled data. Any manual labelling should be differentiated from the original labels, when saved to file.

added Bug label

mentioned in commit 5bbb4b20

mentioned in merge request !5 (merged)

closed with commit 5bbb4b20

mentioned in commit 989c9e7e

mentioned in issue #121 (closed)