[GiNaC-devel] remove_dirac_ONE() and documentation patches

[Vladimir V. Kisil]

	Dear All,

	I am sending three patches for consideration. First two add
  some details to the GiNaC tutorial. The third one replaces
  remove_dirac_ONE() from the clifford.cpp.

  Currently remove_dirac_ONE() uses exceptions in normal operation to
  terminate a chain of recurrent calls. Some people would say that
  exceptions are evil, but this did not cause problems until I try to
  make a port for another evil---Windows. The exceptions in
  remove_dirac_ONE() terminated a Qt Windows application although the
  same code smoothly run under Linux.

  Thus I re-write remove_dirac_ONE() without exceptions. The signature
  of the method has to change, but a user may not notice this in the
  first approximation. Some respective alterations to the tutorial and
  the check suit are made as well.

  Best wishes,
  Vladimir
-- 
Vladimir V. Kisil                 http://www.maths.leeds.ac.uk/~kisilv/
  Book:     Geometry of Mobius Transformations     http://goo.gl/EaG2Vu
  Software: Geometry of cycles          http://moebinv.sourceforge.net/
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