the computed go-to command (O) is now 0-indexed and all invalid indexes and empty labels are ignored

* This has long been a TECO-11 incompatibility.
* The first label in a list has index 0, i.e. `1Ofoo,bar$` jumps to label `!bar!`.
  Consequently 0 is also implied, so `Olabel$` continues to do what you expect.
* `0Ofoo$` was previously also jumping to `!foo!` which was inconsistent:
  All invalid indexes should do nothing, i.e. execution continues after the go-to command.
* Fixed handling of empty labels as in `1Ofoo,,bar$` - execution should also continue
  after the command.
  This eases writing "default" clauses immediately after the go-to.
* The ED hook values now also begin at 0, so most existing ED hook macros should
  continue to work.
* Similarily, the mouse events returned by -EJ also begin at 0 now,
  so fnkeys.tes continues to work as expected.
* It's still very possible of course that this breaks existing code.

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