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Rewrite TIMECOMMAND to be more efficient and not to depend on LOCALMAKE

Add a test that TONE takes about :duration amount of time.
This is a close proxy for it playing the sound for :duration.

Remove the dependency on LOCALMAKE and make small stylistic changes.

Document what happens if you ERASE a variable that shadows another variable via dynamic scoping.
This is part of the resolution for Support Request #50.

Fix a bug in tone() where clicking "Halt" would halt the tone but cause the next command to throw a "Stopping..." error.
Now the TONE/SOUND commands throws the Stopping... error.

Fix a grammatical error

Replace the use of SOUND with TONE.
TONE is a little simpler, since it does require that the inputs be enclosed in a list.

Add a comment that explains why tone() sets frequency to 37 if it's below 37.

Use a variable's value instead of recomputing it.

Reduce the time to compute long wave files by computing only the first cycle and then copying that.