Convolution algorithm

[NickDraper]

We would like a program that convolutes/folds/blurs a specified analytic function with the resolution/blurring function and fits to the measured data.
This should be similar in operation to the existing fitting routines.
The resolution could be in 1 of 3 forms:

1.  An analytic function
   

2.  An ASCII file giving a single curve
   

3.  A workspace with similar structure to the measured input data
   

For options 1 & 2, all histograms use the same resolution function.
For option 3, each input histogram has its corresponding resolution function.

[NickDraper]

This issue was originally trac ticket 853