Remove "sanity checks" for MAD-X commands

The sanity checks did only deny access to commands explicitly requested
by users. Automatically issued commands (like in CALLed files) are much
more of real threat and could not even be handled by these checks.

Closes #56.
Merge pull request #56 from coldfix/remove-sanity-checks

Remove the "sanity-checks" from Madx.command?