Added a new function to crate images with an overlay:

I want to visualise the quality of the border detection. That is why the macro creates some images that show the SR-EELS data-set with an Overlay. The overlay shows the left border, the centre and the right border of the data-set.
Added a missing bracket.
Merge pull request #5 from EFTEMj/scripts+macros

Scripts+macros