With input from Björn Michaelsen and Thorsten Behrens

(moreover, its use breaks parallel build ;-)

Disable the unit tests in sw, as that would duplicate the unit test in
writerfilter now.

Do not remove the old filter yet, so this commit can be reverted later
if needed.

This reverts commit 8ae49824
because no justification is listed

among other things undoubtedly. The idea was IIRC to drop adabas
support, so lets not register the uninstalled components, and
while we're at it not build it either.

If there is a method that needs to be public, better SD_DLLPUBLIC just that one.

This reverts commit 0ae37943.

Then work our way frontward and paint the top one last.

Whether this stuff actually works with the debugging runtime is
another question... The reason why the .cxx and .hxx files in this
commit explicitly undefined _DEBUG is unknown. As usual the old commit
message doesn't give any clue. Hamburg apparently didn't use the debug
runtime in their "dbgutil" a.k.a. "non-pro" builds?