[Nix-dev] Revert `nixos-rebuild switch --profile-name test`

[Daniel Hlynskyi]

Hi. I have following GC roots:
....
/nix/var/nix/profiles/system-140-link ->
/nix/store/7krdihr333i4cl82n7c0afwgrv4k13gd-nixos-system-master-16.03pre75806.77f8f35
/nix/var/nix/profiles/system-profiles/another one try-1-link ->
/nix/store/0xx3nbzplrycjfd3fv1bnniydaanpc6j-nixos-14.10pre50818.b5fe0d3
/nix/var/nix/profiles/system-profiles/nomodeset-1-link ->
/nix/store/1mrd3v1jrhlpim6hadd5s8n8hcw34rgn-nixos-14.10pre50818.b5fe0d3
/nix/var/nix/profiles/system-profiles/test_reboot-1-link ->
/nix/store/wp0af6jfhrb60njxbc765a7pdvh4yg17-nixos-14.10pre50818.b5fe0d3
...

1. How can I remove named system profile?
2. How to find out used space for given GC root?
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