Clisp & Bessel function errors, was: Maxima 5.16.1 release



Hello Robert,

it was a very good idea to install CLISP and run the testsuite.

With CLISP I detected a serious error in the code of the Exponential Integrals.
GCL had no problems but CLISP doesn't work. I have corrected the problem and
committed the change. 

I have also adjusted three tests in the file rtest_expintegral.mac. At this time
rtest_expintegral.mac is not part of $testsuite_files. Should I further wait to
commit the change to enclose the new test file?

Dieter Kaiser