Move the processing of the operator actions for the Morpho_NIST in a separate function, and add support for deleteAllFeatures

This reverts commit 19e5b85b.

Bugfix : forgott to change the get_delta function in the commit 28e381b8

Add the options parameter in the NIST_MDD.get_minutiae() function (compatibility with the super function)

This reverts commit ac28ddb9.

Bugfix : append the name of the Annotation at the end of the Annotation object (.append() is an inplace function...)