Suppress sect2 inside preface TOC

[tomschr]

This PR fixes #425

• Suppress any preface/sect* in TOC for PDF output
• Remove TOC warnings for completely legitimate sections
• Extend the log.message call:
  • Add message-field-length to enlarge message size
  • Add XPath to warning output

[tomschr]

@cwickert I've added another alternative. The last commit 915d1aa enables the sections inside preface. Now we can decide which route we want to go. :wink: Actually, after looking at it, it's not so bad as I thought.

Here is a short screenshot:

[cwickert]

I'm very much in favor of listing individual sections in preface. We can ask others for feedback or just go ahead.

• If we just want to suppress sec2, your first commit will do and we don't need to discuss this any further with the rest of the team.
• If we want to list sections in prefix, I suggest to rebase or squash-merge this as the changes back and forth are confusing.

What do you prefer?

[ghost]

I'd also suggest keeping preface/sect1 displayed & squashing the commits. Ideally, squash into two commits, one for the message change, the other for the actual selector change.

Otherwise, this looks good to me, thanks!

[tomschr]

We can ask others for feedback or just go ahead.

I did so in the SLE writers call. They are also in favor of the second option (with sections).

Ideally, squash into two commits, one for the message change, the other for the actual selector change.

Good idea, will do.

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As all seemed to like a preface with sub sections, I'll merge this PR as soon as CI is finished.

Thanks to all!