[gfsd]Errors in the directory

[Åsmund Skjæveland]

A couple of errors in the dictionary:

 * Mathematics is a separate top-level category (nothing wrong with that, in
   my opinion), but is not listed under Science (which I think it should
   be). 
 * Under Libraries, the GNU Scientific Library is listed twice. 
 * GNUmp is listed as "Library for arithmetic on arbitrary precision
   integers", but if you read the entry, you see that it also deals with
   floating-point numbers and rational numbers. It'd be better to replace
   "integers" with "numbers" in the short description (again, IMO).

-- 
Åsmund Skjæveland 
(address@hidden) 
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