kyrline: relativistic line from axisymmetric accretion disk

Relativistic line emission from an axisymmetic accretion disk. See Dovciak et al. (2004).

par1	a/M; BH angular momentum (GM/c)
par2	theta_o; observer inclination (0 = pole on, degrees)
par3	rin; inner radius (GM/c$^2$)
par4	ms; 0 means integrate from rin, 1 means integrate emission from above the marginally stable orbit only
par5	rout; outer radius (GM/c$^2$)
par6	Erest; line energy (keV)
par7	alpha; accretion disk emissivity scales as $r^{-alpha}$ for $r<rb$
par8	beta; accretion disk emissivity scales as $r^{-beta}$ for $r>rb$
par9	rb; boundary radius between inner and outer emissivity laws (GM/c$^2$)
par10	zshift; overall Doppler shift
par11	limb; 0 means isotropic emission, 1 means Laor's limb darkening ($1+0.26\mu$), 2 means Haardt's limb brightening ($\ln{1+1/\mu}$
norm	photon/cm$^2$/s in the spectrum

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