Created TODO list of possible future extensions

TODO.md

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+# Possible future work in VCFloat
+
+- Common-subexpression elimination, by means of let-expressions, for the purposes of combining redundant deltas and epsilons
+- Automatically calculate annotations (Norm, Denorm, Sterbenz)
+- Allow relative/absolute errors on input variables
+- Allow generalized floating formats (double-double, etc.)
+- Allow flush-to-zero-on-underflow representations (i.e., without denormal numbers). 
+     Remark: In such formats, Sterbenz subtraction works only in the normal range.
+- Interval package could use hardware floats instead of synthesized, 
+     but only where extra precision is not neeeded
+- Make things a bit more efficient by better leveraging reflection and lemmas
+- Use the affine algorithm from FPTaylor
+- Avoid exponential blowup in prune_terms (might not be needed if we use the affine/FPTaylor algorithm)