Give other cmdline operations the -M treatment

[lehitoskin]

Adding or removing tags in batch is kind of slow. I'm certain it'd be a little faster if I gave -A and -D the same treatment as -M. Of course, this should be extended to all of the operations Ivy does. Batch image processing shouldn't have to be done in a for loop in the shell --- because that would make Ivy spawn a new instance every time, which is slow. Just give Ivy a whole bunch of images to process and it'll do that in one go.