cubicweb #2543959 all-in-one.conf: host vs. base-url [open]

The "host" entry in all-in-one.conf should be removed or heavily reworked/clarified:

1. Setting "host" on servers where gethostname() does not return the fully qualified domain name did not help in my case. I had to set "base-url" instead. This contradicts the comment line which reads:
# host name if not correctly detectable through gethostname

2. Entries "host"/"port" and "base-url" are duplicates or at least have overlapping effects. It would be best to keep only either of them or at least document the differences.

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