implementing mksendmanytx

A simple argument parsing change from mktx to allow passing multiple recipients
implementing paytomany (untested)

Just like mktx/payto, this is only submitting the tx created in mksendmanytx
add error message for import_key failure
update default server list, remove offline and pre v0.8 servers
use a qlabel widget for the wallet balance
increase default fee to 0.0005 btc/kb
version 1.7.4
Latest wikia version [tested]

Latest wikia version tested before making the PR
release notes for 1.7.4
make sure default fee is enough
Update default fee in help text
Fixes the QR code widget to include a 10px margin to offset the widget on dark theme background.
Updated the QR Code plugin to enable offline/online wallets to transmit unsigned/signed transactions via QR code.
Merge pull request #214 from rdymac/patch-9

Latest wikia version [tested]
Merge pull request #215 from linhlarry/master

Update default fee in help text
Merge pull request #221 from EnigmaCurry/fix-qr-margin

Fixes the QR code widget to include a 10px margin to offset the widget on dark theme background
Merge pull request #227 from tigereye/master

Sending/Receiving unsigned/signed transactions via QRCode
fix indent
fix indent
Skeleton for menu