This PR is a combined fix for issues #445 and #446

[mxaddict]

It seems that PR#447 did not fix the issue entirely, but it did point to the right direction.

This PR has changes that fix both #445 and #446

1. With original code on 4.6.0 RC, the issue was that a wallet with only a staking address would report negative values for staking report numbers, SAMPLE BELLOW:

{
  "2019-04-26 16:00:00": "0.00",
  "2019-04-25 16:00:00": "-8833.93873429",
  "2019-04-24 16:00:00": "-16719.44565578",
  "2019-04-23 16:00:00": "0.00",
  "2019-04-22 16:00:00": "2.00",
  "2019-04-21 16:00:00": "2.00",
  "2019-04-20 16:00:00": "2.00",
  "2019-04-19 16:00:00": "4.00",
  "2019-04-18 16:00:00": "2.00",
  "2019-04-17 16:00:00": "2.00",
  "2019-04-16 16:00:00": "4.00",
  "2019-04-15 16:00:00": "4.00",
  "2019-04-14 16:00:00": "4.00",
  "2019-04-13 16:00:00": "6.00",
  "2019-04-12 16:00:00": "4.00",
  "2019-04-11 16:00:00": "2.00",
  "2019-04-10 16:00:00": "2.00",
  "2019-04-09 16:00:00": "2.00",
  "2019-04-08 16:00:00": "6.00",
  "2019-04-07 16:00:00": "0.00",
  "2019-04-06 16:00:00": "0.00",
  "2019-04-05 16:00:00": "0.00",
  "2019-04-04 16:00:00": "6.00",
  "2019-04-03 16:00:00": "0.00",
  "2019-04-02 16:00:00": "0.00",
  "2019-04-01 16:00:00": "2.00",
  "2019-03-31 16:00:00": "2.00",
  "2019-03-30 16:00:00": "0.00",
  "2019-03-29 16:00:00": "0.00",
  "2019-03-28 16:00:00": "4.00",
  "Last 24H": "-8833.93873429",
  "Last 7 Days": "-25543.38439007",
  "Last 30 Days": "-25487.38426307",
  "Last 365 Days": "-25202.22851166",
  "Last All": "-25193.35322832",
  "Latest Stake": "-6046.0209064",
  "Latest Time": "2019-04-26 11:57:36",
  "Stake counted": 239,
  "time took (ms)": 1
}

2. And a wallet with only a spending address would report the whole amount in the output as the transaction amount (Instead of only getting the staked amount) samples bellow:

The fix in PR #447 Fixed the balance in the wallet with only "spending" address, but caused the same bug to appear on the wallet with only "staking" address

This PR fixes the issue on 3 wallet scenarios :

• Wallet with spending address
• Wallet with staking address
• Wallet with both spending and staking address

Both the transactions list and the stakereport show the correct values based on my testing

[aguycalled]

utACK

[mxaddict]

@aguycalled , The changes in the branch now should be final, can you give it another look?

[proletesseract]

All modified unit tests make sense and are passing, wallet compiles and runs.