v2.4.0

• Update import path to zgo.at/uni/v2.

• Add oct and bin flags for -f to print a codepoint as octal or binary.

• Add f format flag to change the fill character with alignment; e.g. %(bin r:auto f:0) will print zeros on the left.

• Allow using just o123 for an octal number (instead of 0o123). We can't do this for binary and decimal numbers (since b and d are valid hexidecimals), but no reason not to do it for o.