21c0e3e758 Implement address labeling (Kristaps Kaupe)
Pull request description:
Adds new method `setlabel` to `wallet-tool.py` that allows to set label for wallet address. Setting it to empty string removes label. Labels are shown as additional column in `display` and `displayall` methods.
Full functionality for now is cli only, in Qt GUI is only read-only displaying implemented.
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