Design user interface for withdrawals from kanbanGO

[tmilev]

In order to solve issue 14 from kanbanGo, you need to create a withdrawal request for the kanbanGo.

** Please complete point 1 ** in the workflow below. This is the user interface part.

I hereby propose that each withdrawal request be triggered through a submitting a withdrawal transaction. Perhaps the easiest way to design such a transaction would be to make a regular transaction that sends money to address 0xfffff.... or some other distinguished address (another distinguished address you could choose is the address of SCAR or 0x00000... etc.).

Here's a plan for doing this.

0. [MISSING] Generate a regular kanbanGO transaction sending money from userAddress to 0xffff....
1. [MISSING] Submit that transaction to kanbanGO
2. [Should be there out-of-the-box] Mine the transaction (i.e., include it in a kanbanGO block).
3. [MISSING] After the request is included in a kanbanGO block, trigger the write-back mechanism. The write-back mechanism is the one that is called via the GenerateWriteBackWithdrawal api, however the mechanism must be triggered internally (no api calls necessary).

[harryhe6210]

0 & 1 was implemented and tested.