An all-or-nothing approach to labels isn't flexible enough. Embedded
systems need fine-grained control over what's in and what's out.
That's ideal. For now, separate GPT labels from the rest and allow
g_label to be built with just GPT labels.

Obtained from:	Juniper Networks, Inc.
Timestamps may not have a decimal point.
While here, consistently use sbuf_new_auto().