Revert "Revert "added createmultisig RPC command""

This reverts commit f00780845e34aea8c257bbd21d08bcd4568dd137.
Revert "Revert "added createmultisig RPC command""

This reverts commit a625acaeb471ad585c2b9d81a19985af4eb218b1.
Revert "Revert "added redeemScript""

This reverts commit dce864451cddb34f224e4eb1ec8c01945c7cc67f.