DEx update for selloffer ver 1+0 new and cancel actions
DEx debug session

sell offer over-all
fix bitcoin payment matching
fix amount available and offer calculation on address
change action to be 8 bit

action is now 01, 02 or 03
00 is accepted for transaction version 0000 (backwards comp)
https://github.com/mastercoin-MSC/spec#field-sell-offer-sub-action
add updating and updated_by fields to sell offer

mark old with expired color (gray)
show updated with new color (green)
add debug_address and minor sell offer fixes
remove depracated sell offers from orderbook

the messages are visible on address page, but not needed in orderbook
also skip reporting negative amounts on exodus address as a bug