add pay_invoice menu item
verify if pr has expired
on_header: return early if block_height is missing
install instructions for zbar. fixes #610
let the send tab parse and return its own fields
zbar plugin: use self.win
reuse existing transaction dialog instead of duplicating it
move qr code operations to transaction window and transaction menu
qrscanner: add scan button in init()
don't set column width in update, but only in create
adding file generated by protobuf
fix: show_raw_qr
Merge remote-tracking branch 'upstream/master'

Conflicts:
	gui/qt/transaction_dialog.py
	plugins/qrscanner.py