ieu: add handling of auxiliary data
aux: connect to EUs
functions: deep or/and functions and one-hot decoding
issue: decode station index for aux
aux: pass decoded auxiliary data from decoder through renamer to aux
functions: deal with vectors in "to" order
functions: station index is actually shorter
issue: wrong number of ones!
issue: fix array-size mismatch
decoder: support first version of ISA
functions: 1hot for downto direction
renamer: fix copy-paste
opa: don't confuse a&b
dpram: add an optional bypass