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kdblur2: convolve with the laor2 model shape

A convolution model to smooth a spectrum by relativistic effects from an accretion disk around a rotating black hole. The accretion disk has a broken-power law emissivity profile. Uses Ari Laor's calculation including GR effects (Laor 1991 Modified from laor2 model by Andy Fabian and Roderick Johnstone.

par1 Index: power law dependence of emissivity (scales as $R^{-par1}$)
par2 inner radius (units of $GM/c^2$)
par3 outer radius (units of $GM/c^2$)
par4 inclination (degrees)
par5 radius at which emissivity power-law index changes
par6 Emissivity power-law index for radii >par6