T-Matrix scattering from nonspherical particles.

Class for simulating scattering from nonspherical particles with the 
T-Matrix method. Uses a wrapper to the Fortran code by M. Mishchenko.

Usage instructions:

First, the class should be be initialized. Any attributes (see below)
can be passed as keyword arguments to the constructor. For example:
sca = tmatrix.tmatrix(wavelength=2.0, m=complex(0,2))

The properties of the scattering and the radiation should then be set 
as attributes of this object. 

Attributes: 
    radius: Equivalent radius.
    radius_type: If radius_type==tmatrix.RADIUS_EQUAL_VOLUME (default),
        radius is the equivalent volume radius.
        If radius_type==tmatrix.RADIUS_MAXIMUM, radius is the maximum 
        radius.
        If radius_type==tmatrix.RADIUS_EQUAL_AREA, 
        radius is the equivalent area radius.
    wavelength: The wavelength of incident light (same units as axi).
    m: The complex refractive index.
    axis_ratio: The horizontal-to-rotational axis ratio.
    shape: Particle shape. 
        tmatrix.SHAPE_SPHEROID: spheroid
        tmatrix.SHAPE_CYLINDER: cylinders; 
        tmatrix.SHAPE_CHEBYSHEV: Chebyshev particles (not yet 
            supported).

Definition at line 11 of file tmatrix.py.