Multiple instances minor bug
Hi!
I found minor multiple instances bug.
How to reproduce:
1. Download nemo from git
2. Configure (id, pool, wallet), check Autostart checkbox and bench.
3. Close
4. Make a copy of nemo folder
5. Edit config.json
5.1 in 1st folder
    "SelGPUCC":  "0,1,2",
    "SelGPUDSTM":  "0 1 2",
5.1 in 2nd folder
    "SelGPUCC":  "3,4,5",
    "SelGPUDSTM":  "3 4 5",
6. Start miner from 1st folder. Wait while mining program (ccminer) will start
7. Start miner from 2nd folder. In the start procedure ccminer from 1st miner will be killed <-- bug!

Hope well explained:)