[Ecls-list] Lots of regressions due to -0.0

[Juan Jose Garcia-Ripoll]

If you ever look at the automated build logs
   http://ecls.sourceforge.net/logs.html
you will notice that the ANSI incompatibility tests have jumped from
about 32 to 68 or so.

This is due to the introduction of negative zeros, which are a source
of subtle "mistakes" because i) they are not EQL, but ii) they are =,
EQUAL and EQUALP, and iii) (< -0.0 0.0) is false but iv) (float-sign
-0.0) < (float-sign 0.0).

That causes the hash cache in subtypep to fail, it breaks the code for
handling intervals and other places.

Juanjo

-- 
Instituto de Física Fundamental, CSIC
c/ Serrano, 113b, Madrid 28009 (Spain)
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