Detect OOM kills in standalone mode

[pbordron]

Catch if possible the reason the align process was killed in standalone mode. #111
else probe the RAM consumption of align process & available RAM and write last probed values in logs in case of failure.

OOM Prevention

Put an alert message in web interface in standalone mode when data seems to be too huge for available memory

• Detect available RAM in standalone mode -> psutil
• Define a rule of thumb that estimate the RAM usage per tool -> to add in tools.yaml
• Warning message next to submit button. Must be non blocking.