Continuously update our total object size estimate when cond-fetching
a still-being-streamed object.

Fixes	#1646
Fix indenting in pan_wrk part of panic message
Add a missing ',' in pan_req panic string
If we cannot find nobody/nogroup, lookup current process uid/gid.

If that fails to, bail at ARGV_ERR level.

Fixes #1597
Add missing T mandated by ISO 8601
Add std.time()

Converts an date in various formats to a VCL_TIME.
Clarify comment
Nils patch for retrying partial fetches, with minor changes by me.

Fixes #1638
Fixes #1641
Relax an assertion for the IMS update candidate object

The streaming fetch of an object can fail between lookup time and when
we actually use it. Relax this assertion.

Fixes: #1647
Handle template object failures during condfetch

Fixes: #1648
Varnishncsa escapes non-printable chars.

Fixes: #1378