Use of remark tag preventing Z,M, curved support, SQL-MM attributes from showing in PDF

[robe]

As a result of our new use of <remark> tag in docbook. Two changes have happened

1. These text elements are now showing as yellow-marker highlights in the html docs

2. These are completely left out in the PDF

I suspect because remark is intended to be used as perhaps notes to authors and corrections etc.

The other place it showed was index-aware tag. Since we don't use index aware tag for any xsl filtering, I took out the remark on that. That tags appears in some places in the docs, but usually within note tags, so looked extra funny with the double-yellow.

[strk]

The yellow color can be tweaked in html/style.css file. It looks like our new tag-files are the only ones using that tag so tweaking that color should not produce other unwanted changes.

As per the PDF, I've tried passing -P show.comments=1 as specified in ​https://dblatex.sourceforge.net/doc/manual/show.comments.html but it didn't seem to work.

The reason why I'm using <remark> is because we need tag to contain everything found in the tag_*.xml files for xml2pot to extract that content. Such tag ideally would have no other effect than grouping both the inlineimage and the paragraph to be translated, and produce no newline at its end. The remark tag seems to work for this. I've tried <para> (but introduces a neline) and I've tried <markup> (is not understood by xml2pot).

Tags that are supposedly supported by xlm2pot can be read here: ​https://github.com/KDE/poxml/blob/master/parser.cpp#L34

[strk]

Another option would be using the <tip> tag, which is currently unused, and reques using the check.png file instead of the tip.png file to render that

[strk]

I tried the <tip> idea, but it introduces a newline, which we don't want. Another option I've been thinking about is now that we have xsl-config.xml we could put all the text to be translated in that file and have a generator for each of those tag files that would use the xsl config text to generate them

[Sandro Santilli <strk@…>]

In 81e0db7/git:

Generate tag files from xsl-config.xml, fixing PDF output

Closes #5424