Allow multiple note names with equal temperament.

[matj1]

If I specify an equal temperament with note names like

perl LSDJtune.perl -b A5 440Hz -e 5 --names A,B,C,D,E

, it complains so:

Wrong number of note names, expected 1 at LSDJtune.perl line 118.

That is because the number of notes in the equal temperament is converted to a single step in cents so it expects only one note name. But only one note name is not useful.

I suggest that equal temperaments would be converted to series of steps spanning a whole octave so it would take exactly as many names as steps in an octave.

A second viable option is that equal temperaments would be converted to series of as many steps as note names so note names would not have to repeat at octaves.