[RFC] Prevent unnecessary recompilation for trivial params.def changes

[Tom de Vries]

Hi,

this patch adds generation of params.list, a file containing a list of 
names of all the parameters in params.def.

By including params.list in params.h, rather than params.def itself, we 
prevent recompiling the 118 c files that include params.h for trivial 
changes in params.def, such as f.i. changing the default value of a 
parameter.

I did a minimal build with the patch, and tested the behaviour by doing 
both trivial an non-trivial changes in params.def, and rebuilding.

Any comments?

Thanks,
- Tom
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