Update `inttag` to not assume TAG events are sorted in time-order. This is helpful when users are manually splicing together multiple tag files. E.g., when `allevents=True`, use `.min()` and `.max()` instead of `[0]` and `[-1]`: https://github.com/spacetelescope/stistools/blob/master/stistools/inttag.py#L110