Ignore various autogenerated files
4.0 updates
Fix std.duration documentation of qualifiers

std.duration conversion function has a mandatory qualifier. Change the
wording from 'can' to 'must' specify the qualifier.

Add a test case for a string without a qualifier.
Add 'ms' conversion qualifier to std.duration

Add 'ms' conversion qualifier to std.duration, and update
documentation and test case.

Fixes: #1434
Rename =build/ to build/

That silly equality sign constantly needed to be escaped and
is just unecessesary finger gymnastics. Die, please.
Make the TOC look sane PDF/latex version
Assorted minor documentation fixes
Sync with vmod.vcc
Minor cosmetic changes
Wording, less genitive in the heading
Introduce two new states in backend-fetch state machine: retry and error
Extract the bereq->obj creation code to a separate function
Make bereq.* vars available in vcl_backend_error{}
Shift the 503 creation into the error step.
Only attempt to salvage an object into Transient if it wasn't already
destined for Transient in the first place.
remove a couple of pointless copies of the HTTP status.

Pick it out of struct http when needed.
Ensure that bitfields get set.
Use the correct flag to controll EXP_Touch() calls
Gently shuffle things around a bit.
Deal with BS_ERROR much earlier