The `Union_test_texture` Instrument

Simple test instrument for Texture functionality in Union framework.

Identification

simple test instrument for texture sample component.

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
lmax	AA	Maximum wavelength treated by texture process	0
crystal_fn	string	Crystal structure file name	"Zr.laz"
fcoef_fn	string	Fourier component file name	"coef_Four_L2.txt"
barns		Flag to indicate if \|F 2\| from "crystal_fn" is in barns or fm2 (barns = 1 for laz, barns = 0 for lau type files).	1