Minor build errors on some platforms

[Keith, T. <ke...@um...>]

We use qwtplot3d on a variety of platforms, including Win32, Mac-OSX, =
Irix, Solaris, AIX, HPUX, Linuxes, etc. ... We use the typical build =
environments on these platforms and the corresponding default Qt release =
compiler options.  Please consider the following minor changes to avoid =
build errors with qwtplot3d.  Thanks!
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qwt3d_helper.h
----------------------
Please change name of MAX() function.   "MAX" function name gets =
clobbered by preprocessor macro in at least one build environment, which =
then produces compilation errors.
=20
qwt3d_openglhelper.h
-------------------------------
Please change "list" to "lst" (or something else) in SaveGlDeleteLists.  =
"list" variable name gets clobbered by preprocessor macro in at least =
one build environment, which then produces compilation errors.
=20
qwt3d_types.h
---------------------
Please remove the unnecessary comma after the last enum item (FLOORDATA) =
in the FLOORSTYLE enum.  Causes compilation error in at least one build =
environment.
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qwt3d_colorlegend.cpp
---------------------------------
Please change the "orient" to "ori" (or something else) in =
ColorLegend::setOrientation().  "orient" variable name gets clobbered by =
preprocessor macro in at least one build environment, which then =
produces compilation errors.
=20
qwt3d_types.cpp
------------------------
Change #include "float.h" to #include <float.h> since float.h is a =
"system" header.
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qwt3d_types.h
---------------------
Triple and Parallelipiped classes need explicit copy constructors and =
operator=3D() functions.  Irix 6.5 when compiling with optimization.
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qwt3d_plot.cpp
----------------------
void Plot3D::createCoordinateSystem()
{
  calculateHull();
  Triple beg =3D hull().minVertex;
  Triple end =3D hull().maxVertex;
  createCoordinateSystem(beg, end);
}
Irix 6.5 when compiling with optimization ...
=20