[conformal/btcd] 6d8b87: Raise maxStandardSigScriptSize to 1650.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcd
  Commit: 6d8b873923a0f9ba0a8d0716b99136c7e242a00c
      
https://github.com/conformal/btcd/commit/6d8b873923a0f9ba0a8d0716b99136c7e242a00c
  Author: Dave Collins <da...@conformal.com>
  Date:   2014-05-23 (Fri, 23 May 2014)

  Changed paths:
    M mempool.go

  Log Message:
  -----------
  Raise maxStandardSigScriptSize to 1650.

This commit raises the maximum allowed size for a standard signature
script to cover a 15-of-15 multi-signature pay-to-script-hash with
compressed pubkeys.

This mirrors a recent change to remain compatible with Bitcoin Core.

ok @owinga who also helped verify and correct the script math.

Closes #128.