Rather create new order-only dependencies on directories where
targets should be delivered.

On cygwin this is much faster.

The tables functionality in Writer documents need SbxValue.

The root cause for the problem was in solenv/bin/concat-deps.c, has
been fixed now.

This reverts commit af9618b2.

Don't add special handling for second and following
categories.

[From Markus's patch email to the list, edited by tml]

This patch is not obvious and I'm not sure that it will not introduce
another regression. I don't fully understand why we need to add
special handling for labels of second and following categories.

When a texbox is contained inside a table cell... we were running into
some troubles when creating the table: the reference to the paragraphs
inside the textbox were passed to the TableManager. This was leading to
missing references when converting to a table because the paragraph
references within the textbox were dropped.

 In the process, remove the ImplControlProperty struct,
 since it was duplicating information already stored in the
 key of the map.