This switches the 'remotes/origin/HEAD' and uses the current HEAD of the
current checked out git repo.
Revised the sed rule that is transforming (to be more specific on the
matching regex /-\d+-g/ than just the first /-/):
8.3.530-7-gb64321d4 => 8.3.530+7-gb64321d4 (replace first '-' with '+'
to indicate it is tag plus this many commits)
8.3.530 => 8.3.530 (no change)
This switches to the 'continuous' tag release, that will auto update.
This broke the very old AppImage7 tool since that release not return
HTTP/404. But I updated all to use their current recommendation.
Upgrade Tcl to 8.6.16
Use versioning to include tag, indication of timestamp and git hash.
Rename to include '7' in the labeling (as it is EL7 based)
Improve log output to keep information about versions used.
Update README.md a little.
Darryl L. Miles