get_contact_alphabetic_index

Checks which alphabetic index contact would be sorted into according to this.

So long as the active alphabet does not change, the returned index will be a valid position in the array of labels returned by get_alphabet.

If the index returned by this function is needed for any extended period of time, it should be recalculated whenever the alphabet changes.

Parameters:

this	an BookClientCursor
contact	the Contact to check

Returns:

The alphabetic index of contact in this.