sendrawtx_MP: add optional reference amount parameter
Begin to provide full RPC help information

Before:

getactivecrowdsales_MP
getactivedexsells_MP
getallbalancesforaddress_MP address
getallbalancesforid_MP currencyID
getbalance_MP
getcrowdsale_MP propertyID
getgrants_MP propertyID
getproperty_MP propertyID
gettransaction_MP "txid"
listblocktransactions_MP index
listproperties_MP
listtransactions_MP
send_MP
sendrawtx_MP
sendtoowners_MP

After:

getactivecrowdsales_MP
getactivedexsells_MP
getallbalancesforaddress_MP "address"
getallbalancesforid_MP propertyid
getbalance_MP "address" propertyid
getcrowdsale_MP propertyid
getgrants_MP propertyid
getproperty_MP propertyid
gettransaction_MP "txid"
listblocktransactions_MP index
listproperties_MP
listtransactions_MP ( "address" count skip startblock endblock )
send_MP "fromaddress" "toaddress" propertyid "amount" ( "redeemaddress" "referenceamount" )
sendrawtx_MP "fromaddress" "hexstring" ( "toaddress" "redeemaddress" "referenceamount" )
sendtoowners_MP "fromaddress" propertyid "amount" ( "redeemaddress" )
Merge pull request #158 from dexX7/mcore-begin-rpc-help

Provide more RPC help information + sendrawtx_MP: add reference amount