compact serialized format for unsigned and partially signed transactions.
cleanup (dead code)
print traceback in waiting dialog
fix add_keypairs: support old wallets
serialize: do not use x_pubkeys if we have enough signatures.
help text for signrawtransaction
getmpk: return list of accounts
show number of tx signatures in gui
fix: edit label
message: cosigner wallet
fix bug with the order of signatures in tx input
detect if wallet can sign tx before showing sign button
tx dialog hooks
First cleanup branch commit

This fixes some import and whitespace issues to align closer to pep8.
I added a few comments to make further contributions easier.
Removed uselss comment.
Merge pull request #730 from chrisglass/pep8ing-phase-one

First cleanup branch
fix import
various bugfixes for imported addresses
catch exceptions raised by fiat amount conversion to decimal
minor fix