Isis3: Relevant comment dropped from image label

[lwellerastro]

ISIS version(s) affected: isis5.0.0

Description
When an image is updated by jigsaw a comment is added to the image label specifying when the image was updated, typically right before the InstrumentPointing and InstrumentPosition Objects.

For example:
# Jigged = 2021-05-07T11:06:11

The comment no longer appears in the image label of a jigsaw updated image as of isis5.0.0. This is the only difference between the labels of an image updated via isis4.4.0 and isis5.0.0.

This comment has been included in our labels for at least over 10 years. I use it extensively to determine if and when my images have been updated, particularly when looking at large volume of data.

How to reproduce
Run jigsaw setting update=true in a prior version and the latest version. Compare labels.

See /work/users/lweller/Isis3Tests/Jigsaw/Label/ for catlab ouput and updated image from isis4.4.0 vs isis5.0.0.
See /work/users/lweller/Isis3Tests/Jigsaw/Label/Network/ for a small network and jigsaw command for updating if you need test data.

Possible Solution
Recover the lost comment!

Additional context
The same problem occurs for images updated by deltack

# deltackDirectAdjusted = 2021-05-07T11:28:45

It's possible there is a similar issue for qtie updated images, but I have not checked this.

[jessemapel]

This is a bug, when we moved to the new Table logic, we only copy over keywords to the BLOB label and didn't add logic to copy over comments. Should be a simple fix.

[scsides]

NOTE: ISIS PVL attaches comments to keywords or groups or objects (what ever immediately follows them). At one time reading a keyword and writing it should have copied the comment too.

[jessemapel]

jigsaw attaches the jigged comment directly to the Table's Label, not any of the keywords. So, copying over the keywords doesn't catch these comments.