Perl Style: Length of Variable Names

`The appropriate length of a name is inversely proportional to the size of its scope.' --Mark-Jason Dominus

Length of identifiers is not a virtue; clarity is. Don't write this:

    for ($index = 0; $index < @$array_pointer; $index++) {
         $array_pointer->[$index] += 2;
    }

When you should write:

    for ($i = 0; $i < @$ap; $i++) {
         $ap->[$i] += 2;
    }

(One could argue for a better name than $ap, though. Or not.)

Global variables deserve longer names than local ones, because their context is hard to see. For example, %State_Table is a program global, but $func might be a local state pointer.
```
    foreach $func (values %State_Table) { ... }
```