ENH: Add SafeBorder to BinaryMorphologicalClosing

Simple case of missing IVAR definition. The BinaryMorphologicalOpening
does not have this method.

Change-Id: I90ef760f99c328cbc007acfadb176d877dfd3d60
Adding test of SafeBorder for BinaryClosing

Change-Id: I9113fc3fcfc28679ea573e1f8bc29418d39955c3
Removing in Prefix from Kernel template procedural method.

Change-Id: I4cc42420b0cfb99d0542021436ca15b2647972e0
Adding SafeBorder to Grayscale open and close

Change-Id: I3d8872a3dc00a2fb1a1d80806b95b4a49fc91a2d
Merge topic 'SIMPLEITK-365_AddSafeBorderToBinaryMorphologicalClosing' into next

67caaaf Adding SafeBorder to Grayscale open and close
ae4b375 Removing in Prefix from Kernel template procedural method.
a7eacd8 Adding test of SafeBorder for BinaryClosing
ffaba1c ENH: Add SafeBorder to BinaryMorphologicalClosing