Updates to fromAlgorithm

*  Changes to fromAlgorithm adding a progressCounter.  This makes it simpler to track enrollment/comparison progress from an external application linking to OpenBR.
*  Minor progress formatting changes.

@caotto do you mind taking a glance?
How does count work when progress is # of bytes into a gallery file? I intentionally avoided exposing total progress because it doesn't make a lot of sense to users for it to be e.g. 50,000,000 bytes