Updated Requests

- added Date and Account field to Saved Requests
- requests are now saved as dict()
  old requests will be deleted!!
- Account field is hidden when only 1 account is available
- address line now follows the current_account
- saved requests is sortable, default sorted by date
- saved requests only shows request for current_account
add NotEnoughFunds exception
commands mktx fix
Merge branch 'master' of https://github.com/spesmilo/electrum into daemon
remove deprecated files from app.fil
set data_files only when install is invoked
update README with pip
Fix currency type for bitcoinvenezuela history

update exchange rate history for bitcoinvenezuela exchange
fix column number for monospace font (amount)
Merge branch 'contacts' of github.com:Tafelpoot/electrum into Tafelpoot-contacts
various fixes for reveive_requests
Merge branch 'Tafelpoot-contacts'
mktx dialog fixes
Merge branch 'master' of https://github.com/spesmilo/electrum into daemon