Merge pull request #410 from thgh/patch-1

Update help text about tx fee
IPv6 support
Merge pull request #414 from 3M3RY/IPv6

IPv6 support
fix for issue #417, adds new column for requested amount

also adds a menu option to display the invoice again if it's been closed
Merge pull request #419 from wozz/POS

POS Plugin Update
on sl error: print exception inside for loop, and do not continue the loop
Old addresses on receive tab grayed out