Removed duplicate code.
Fixed reference.
Added a check on the diffusivity and adapted documentation.
Rewrote the implementation.
Added a todo note to extend code to structure tensor computation.
Remove duplicate code.
Renamed function.
Adapted function name to file name change.
Fixed bug where parameter was forgotten to be passed.
Updated See also section.
Added explicit anisotropic diffusion.
Bugfixes.
Added missing scaling coefficient.
Added warning when step size becomes too small.