off-by-one error in TextGrid output

[timobaumann]

Hi, both the tone tier (but not the break tier for some reason) in TextGrid output starts numbering with "2" and ends with an index one larger than the "size" value of that tier.
Praat apparently doesn't mind, but it would be nicer if indices were used as intended (well, there's no format definition, but I guess that numbers starting at 1 --or 0?-- better matches the format intention).
Also, my own TextGrid parsing fails as it is more (too?) strict :-(