Wands are not checked for self-framingness

[marcoeilers]

After a commit made to address #201, magic wand self-framingness checks were disabled completely. Malformed wands will still fail when they are applied or packaged, but can be inhaled. For example:

field f:Int

method foo(r: Ref)
{
    inhale true --* r.f > 9  // Silicon accepts this, Carbon complains here
    apply true --* r.f > 9   // Silicon only complains here
}

Found by @jackstodart