New improved, or at least more functional, expression parser and evaluator.

Now can deal with both floating point and integer values.
You can use the functions from the standard C maths library which take
one argument.
Evaluation should be faster, 'though parsing is probably a bit slower.
Now the user-supplied evaluation routine is called just once at the
beginning of the evaluation, so if any of the evaluations need a global
operation, these can all be done at once.

The routines have now been renamed as Util_ functions and the
header file cctki_Expression.h has been renamed as util_Expression.h.

IMPORTANT NOTE:

The above means you will need to

rm configs/*/build/Cactus/util/Expression.c.d
rm configs/*/build/Cactus/main/Groups.c.d

after updating to get rid of stale dependency files.

Tom


git-svn-id: http://svn.cactuscode.org/flesh/trunk@2449 17b73243-c579-4c4c-a9d2-2d5706c11dac

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