[GiNaC-devel] Bug fix polylogs

[Stefan Weinzierl]

Dear all,

this is a bug fix for the bug reported in
  http://www.cebix.net/pipermail/ginac-list/2015-July/002053.html

The bug occured because a call to ex_to<numeric>(y) inside the polylog routines 
would fail for
y=sqrt(2), resulting in a sub-sequent segmentation fault.
In GiNaC sqrt(2) is treated as an exact number, not as a floating number.
With the fix, the routine now returns unevaluated (as it should).
An explicit call to evalf() forces a conversion to floats.
In order to enable this, the option do_not_evalf_params() has been removed for 
the G-functions. This is safe for the G-functions, the purpose of the
do_not_evalf_params-option is to avoid a conversion of genuine integer 
arguments (as in Li, S, H, zeta1 or zeta2) to floats.

  Best wishes,

    Stefan
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