DocBook: implement CALS tables

[Thibaut Cuvelier]

Dear list,

Here is a patch to improve DocBook support by allowing the user to choose
the way they want tables to be output (i.e. either HTML or CALS, right
now). This amounts to including a switch in the GUI (did I do this right?
the diff for the .ui file is quite large for what it does) and, depending
on the value, output in HTML or CALS.

I preferred to use an enum and a dropdown for this parameter, as using a
simple checkbox would seem to be awkward (it's a choice between two
mutually exclusive options — you *have to* pick one —, it's not something
you enable or not).

Apart from the UI part, I feel rather unsure about the implementation of
row separators: I don't really understand the LaTeX code that outputs
\toprule, \midrule, \bottomrule, or \hline… It sits in Tabular::TeXTopHLine
and Tabular::TeXBottomHLine. Or can I just copy-paste the code that sets
nset, have_trims, and the others, and have the same logic? (It just looks
too cumbersome…)

Thanks!
Thibaut
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