Fixed #284 using API calls

[pmconrad]

...as recommended by abit.

[abitmore]

Looks fine. May need testing. @oxarbitrage can you help?

[oxarbitrage]

definitively, will test today and send feedback!

[oxarbitrage]

i was able to reproduce the error of issue #284 from @Xeldal in a private testnet by setting up the nathan account exactly as he describes. this is by adding an additional key to owner and an additional key to active.

i was able to do this by putting the call update_all_auth from here: #270 into the test environment code.

after adding this additional keys i started a new wallet and imported nathan priv key and the private key for the active i added before to nathan.

following the setup described i don't have the priv key for the additional owner key so i don't import it in the new session. thereshold and weight remained always at 1.

in unpatched versions when trying to transfer error msg described by #284 is thrown and transfer can't be made.

in a patched version with this pull request transfer goes throw.

works good, i am merging the pull. good job @pmconrad

offtopic:
resumed work in #270 with the suggestions sent by @pc and @TheTaconator and @vikramrajkumar as it is a really needed function.