Add option to Fit to output convolved components

[Roman Tolchenov]

When fitting with Convolution and the model is a composite function Fit must have an option to output each model's component convolved with the resolution.

[Roman Tolchenov]

Added Fit option to output convolved composite components. Re #8066

Changeset: 62202ab61d3e79eabd4b8d22105db5989a5f4f01

[Roman Tolchenov]

To tester:

1. Create this function in Fit browser:

(composite=Convolution;name=Gaussian,Height=0.3989,PeakCentre=0,Sigma=1;(name=Gaussian,Height=1,PeakCentre=0,Sigma=1;name=Gaussian,Height=1,PeakCentre=1,Sigma=1)).

You can copy it to the clipboard then go to Setup->"Manage Setup"->"Load from string" in Fit browser and paste it there.

2. Use the attached workspace to evaluate the function (Fit->"Evaluate function") with "Convolve members" option on and off.
3. When the option is off the output workspace must contain 6 spectra: Data, Calc, Diff, Gaussian, Gaussian, Gaussian.
4. When the option is off the output workspace must contain 5 spectra: Data, Calc, Diff, Convolution, Convolution.
5. Compare the two last Gaussians from the "off" computation with the Convolutions from the "on" one. The Convolutions must be wider and lower.

[Roman Tolchenov]

Updated the wiki description. Re #8066

Changeset: 344970d61453c8e18731951d0c7aed06e89abe36

[Roman Tolchenov]

The option can apply now to not root level convolutions. Re #8066

Changeset: 3caff1f7549a6e8a37c133b2b27fd35c1a9b43f6

[Roman Tolchenov]

Apply the option to a non-composite function in Convolution. Re #8066

Changeset: ef3424c6ae8502407a20e502285976ee8c530d5c

[Wenduo Zhou]

It works well as described.

[Wenduo Zhou]

Merge remote-tracking branch 'origin/feature/8066_output_convolved_components'

Full changeset: ​15969870e88191edd6b7774e0f61b8b48d183066

[Stuart Campbell]

This ticket has been transferred to github issue ​8911