[WIP] Fixing Travis build

[rolanddenis]

PR Description

Fixing Travis conflict between matrix and jobs directives, and some other warnings and infos (see #1463)

We should maybe wait a little bit before merging in case of deployment of Travis dpl v2 was a mistake...

Checklist

• New entry in the ChangeLog.md added.
• No warning raised in Debug cmake mode (otherwise, Travis C.I. will fail).
• All continuous integration tests pass (Travis & appveyor)

[dcoeurjo]

waoh.. thx for the debug.... looks like you've spotted the bug.
How did you find it?

[dcoeurjo]

👌 merging this one BTW (fixes Bertrand's mail)

[dcoeurjo]

oops I merged the wrong duplicate :)

[dcoeurjo]

could you just push a Changelog entry ?

[rolanddenis]

waoh.. thx for the debug.... looks like you've spotted the bug.
How did you find it?

No magic 😅 : in the job details from your PR : https://travis-ci.org/github/DGtal-team/DGtal/builds/662684925/config?utm_medium=notification&utm_source=github_status

Just below the two tabs Buid jobs and View config, there is a line Build config validation with a red cross meaning that there is an error in the config. Expanding the line, it tolds about a conflict between matrix and jobs. In the (not completely updated...) documentation of Travis, I understand that matrix and jobs directives have been merged in the dpl v2 (that is still documented as in beta stage...)

[dcoeurjo]

👌 thx