Add `--lite` option to vp-comparefits for quick comparisons
Created by: scarlehoff
The default remains the normal comparefit but this adds an option to have a quick comparison without the heavy stuff (i.e., without anything that involves doing the fktable convolution with all replicas).
This is quite useful when iterating overfit when you just want to see whether the cuts are the same, how the PDF/distances look etc.
Closes #1553 (closed)