Cozz11

Based on #4305 to avoid merge conflicts.

#3959 introduced that fees are not rounded anymore up to 1000 bytes.
This results in that coin control guesses the fee wrong very often.
So I would like to make 2 changes:
- add "~" in front of fee and change; show a tooltip "Can vary +/- %1 satoshi(s) per input."
- remove "After fee". This was meant for the workflow "Send all minus the fee".
  But this does not work reliable anymore, so I would want to remove it.
  I have already code for an inclusive fee checkbox to the sendcoinsdialog prepared, which
  could then be a replacement for this workflow.

![removeafterfee2](https://cloud.githubusercontent.com/assets/2814559/3224464/12072650-f036-11e3-9bc3-d44ef3c9af7f.png)