Add flags for suggesting curves to get to a specified t-level, and constraining the B1/curves to get there

-w <existing work t-level>
-t <desired t-level>
-c <constrained curve amount>
-b <constrained B1 amount>
-p <constrained param>

Switch to exp(-1) failure chance t-level calculation, add -e flag to also show ecmprobs.html style Expected Factor Size calculation. switch -t flag to -w --work to match yafu convention.

add -t -q and -i flags

support for all params and improved performance