The `Test_ML_elliptic` Instrument

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Unit test instrument for Multilayer_elliptic

Identification

Tests the correct working of the mulitlyer_elliptic component both using a
reflectivity file and the kinematical approximation.

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
S1	m	Distance from source focus to multilayer centre.	1
S2	m	Distance from multilayer centre to focal point	2
gamma	deg	Design glancing angle at centre.	1.2
fromfile		If nonzero read reflectivity number from a datafile ("reflectivity.txt")	1
fxw	m	width of the beam	1e-9
fyh	m	height of the beam	1e-9