User should be able to set unused register width for bulk reads.

[tannerblair]

Currently all registers in the clumping algorithm must be contiguous. The user should be able to specify a certain acceptable distance between two non-contiguous registers. EX:

Registers Used: {2, 1, 5, 6, 7, 9}
Distance = 0
Groups: {1 to 2}, {5 to 7}, {9}
No Mask

Distance =2
Groups: {1 to 2}, {5 to 9}
Mask 8

Distance = 4
Groups {1 to 9}
Mask 3, 4, 8