Sarah

update to 1.18

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## Purpose Update to 1.18 due to issues with compatibility. ## Approach Updated the poms, fixed deprecation issues

Transactions Tab

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"This week" seems to display the same information as "Today"

getblocktemplate crashes QT wallet

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using the command getblocktemplate crashes the wallet.

Some rawtransactions are longer than the amount of characters the QT GUI is set to handle.

 from debug.log ``` 2018-12-23 10:13:51 GUI: Qt has caught an exception thrown from an event handler. Throwing exceptions from an event handler is not supported in Qt. You must...

You are unable to leave the calldata empty when using the `sendtocontract` RPC method.