SANS: Allow MASK/LINE width angle x y (easy to test)

[Anders-Markvardsen]

This ticket is blocks : TRAC7531

Rob writes:

Sarah and I have been trying some new experiments on SANS2D and have found the need to tweak the masking process.
Please find attached a version of isis_reduction_steps.py which allows an angled line to be placed in the mask with an arbitrary origin.

The command should now take

MASK/LINE width angle
or
MASK/LINE width angle x y

where x and y are in meters from the beam center.

I've checked that it works for both cases using the file attached.
Could you modify the file in the main distribution and look at making sure that the two new bits of information appear in the mask table in the gui as well as modifying the documentation.

[Anders-Markvardsen]

This issue was originally trac ticket 7503

[Anders-Markvardsen]

http://trac.mantidproject.org/mantid/raw-attachment/ticket/7503/mask.txt
(uploaded by Gesner Passos on 2013-07-26T10:26:10)

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http://trac.mantidproject.org/mantid/raw-attachment/ticket/7503/line_mask_output.png

(uploaded by Gesner Passos on 2013-07-26T10:36:34)

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