Clean up and document DEC decoder
Comment chien a bit
Make improvements to decode serial

Fix serial_standard_multiplier (self contain)
rename finite_adder to finite_parallel_adder
Add a finite_serial_adder
Additional serial decode work

Use finite_serial_adder, rearrange code into order it runs in
explicitly code dual_to_standard module
Some attempts at beta cleanup
More serial decoder cleanups
More serial cleanups, fix serial mixed multiplier
Remove some unused vars
Do some cleanup of beta in parallel multiplier
further parallel decoder cleanups
Further parallel updates
Additional naming updates