#303 More options for rendering of multi-term varlistentry

[Michael(tm) Smith]

For multi-term varlistentry output, stylesheets are
hard-coded to render the terms inline, separated by a
comma; like this:

term1, term2, term3
Listitem output associated with the terms.

While that works fine if the terms are short, it does
not work so well if you have long terms. In the case of
varlistentries with long terms, it would be better to
have them rendered on separate lines; like this:

some really long term,
another really term that's maybe an alias for first,
yet another term in the set
Listitem output associated with the terms.

Also, in that case, some users would probably prefer
not to have the comma rendered as a separator at the
end of each term. So we should make the separator
configurable -- so users can use, say, a semi-colon, or
can just set it to an empty string.

[Michael(tm) Smith]

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A change for this issue has been added to the current codebase.
Please test the change with the latest snapshot from:

http://docbook.sourceforge.net/snapshots/