Add the next functions: WriteOneBandOfMultibandImageToGrayImage, WriteMultibandImageToGrayImages.
Merge branch 'master' of https://github.com/solrac-ceam/DIP_DeepLearning

Conflicts:
	multibandImage.c

add the next functions: WriteOneBandOfMultibandImageToGrayImage, WriteMultibandImageToGrayImages; and modify the .ignore file.