Intensity and Sigma wrong for NoFIt IntegratePeaksMD2

[VickieLynch]

The INTI and SIGI values that are given for each peak in the profile
file are not correct. The INTI that is given is the sum of all 100
counts and the SIGI is the square root. It should be

INTI = Peak - Ratio_Bkgd
SIGI = sqrt(Peak + Ratio_Ratio*Bkgd)

If the Peak is the sum of the middle 80 channels, then BKGD is the sum
of channels 0-9 plus 90-99. The Ratio is then 80/20 = 4.

[VickieLynch]

This issue was originally trac ticket 10541

[VickieLynch]

http://trac.mantidproject.org/mantid/raw-attachment/ticket/10541/verify10541.py
(uploaded by @VickieLynch on 2014-11-14T13:40:41)

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http://trac.mantidproject.org/mantid/raw-attachment/ticket/10541/verify10541.peaks
(uploaded by @VickieLynch on 2014-11-14T13:44:31)

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http://trac.mantidproject.org/mantid/raw-attachment/ticket/10541/verify10541.mat
(uploaded by @VickieLynch on 2014-11-14T13:44:49)

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http://trac.mantidproject.org/mantid/raw-attachment/ticket/10541/NoFit_integration.ods
(uploaded by @VickieLynch on 2014-11-14T14:09:17)

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