... and allow for comments inbetween format definitions

Also internalize CONF_Add as conf_Add as it is not used outside config.c

Fixes #3
was actually caused by the fix for #2 (and I failed to recognize this)

Fixes #2

See varnish-cache commits
* 2da6c5e539f8f858c446812d30f00de600ecc3e4
* 63807dd22725653e23c20071a9eb958642413f36

Ref varnish-cache master 2d0843eac8d77cfb3369591a61234d9c3ed6881e

Introduced

Ref: varnish-cache 9ad80c88f26d9a90d21b59f265d31be61ae545a0

The VSM API has changed.

Ref: e9c70c7306eb94c14768648dca03fc5b6c3252f9

in particular to find varnishncsa

do that any more. But will have to revisit the formatting, because
Varnish VSL and its tools apparently don't use VSB_quote for binary
data any more.