Resolve "move call of "form()" out of the loop in obsprocess.computeGradV()"

Closes #3 (closed)

assigned to @harry.cousin

added 4 commits

• c087bb0e - move the call to the form function out of loop
• 713eaa63 - add assert test
• 8cc6c0ff - add function to excecute string to form
• e513f80d - added unit test for the txtDiffusionModel class, tested

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marked this merge request as ready

merged

mentioned in commit 6bdeb174