This changes behaviour: before if the owner/amount didn't match, it
resulted in a successful execution without doing anything; now it
results in a failed execution using the revert opcode (remainder gas
is not consumed).
This patch fixes the following issues:
* The contract executes send() when it does not have enough balance.
* The contract always sends a total amount of zero.
The wrapper code is adapted from the swarm/services/chequebook package
with the following mostly cosmetic changes:
* The code now uses the new Go API interfaces to query balances. Some
minor functional changes were required to make this work.
* The package no longer depends on swarm/services/swap/swap. References
to swap.Promise are replaced by interface{}, the base type of Promise.
This is temporary.
* The contract wrapper has been regenerated with latest abigen
and solc v0.3.6.
* There is a new generator that creates the 'deployed code' variable.
* Documentation comments now follow the recommended godoc style.
* [CHEQUEBOOK] log prefixes are gone.
* LGPL license headers have been added to all files.
