Since there has not been a response (and since I am still unhappy with the
limitations of \definesynonyms) I came up with my own solution which is
included in this mail. The code provides a fully automated handling of symbols.
I think this might be useful for a lot of people in engineering,
The synonym "sym" defined by \definesynonyms[sym][syms][\symdesc] can take 2
entries by default:
\sym[]{}{}
For theses and whitepapers in the natural sciences and in engineering it is
needed to introduce another entry for the unit:
\sym[]{}{}{} (<-- This does of course not
compile, take it
