recovery: properly catch SIGINT

Ignore SIGINT in all processes but Main
recovery: fixed help for -g

Now by default we use all available groups
Added debug in case cache was not turned on
Merge pull request #126 from SaveTheRbtz/master

Recovery. Improved admin expirience.
Merge branch 'master' of github.com:reverbrain/elliptics
Merge branch 'master' of github.com:reverbrain/elliptics