Implement Dec() and PrettyDec() properly

[karalabe]

When printing ints in logs or console, it's usually better to print as a decimal vs hex. But there's no way to flatten a uint256 Int currently into a decimal string. It feels a bit wonky to do uint256.Int.ToBig().String()

[holiman]

There should be two methods:

• One that prints to decimal: e.g 123012313 (see Dec below)
• One that pretty-prints with thousands-separators: 123,012,313 (PrettyDec?)

ps, Dec exists and currently looks like this:

func (z *Int) Dec() string {
	return z.ToBig().String()
}

[karalabe]

Erm, it does not exist?

[karalabe]

Ah, sry, when I backported the log change from my PR I didn't backport bumping the uint256 lib version.

[holiman]

I'll reopen this, we should still implement it "properly" without going via big

[holiman]

Fixed by #130