* koch: add --localdocs to allow building only local docs
This flag also make koch doc use the passed arguments when building
the offline docs.
This is useful when generating nightlies as we would want to use
--doccmd:skip and also skipping a pass of docgen speed things up
drastically (for non-native targets).
This flag superseded the undocumented --docslocal.
* kochdocs: filter google analytics code from the arg list instead
This commit introduce a small PEG expression to filter out the google
analytics code before building local docs when --localdocs is not
specified. This lets us keep any arguments unrelated to google analytics
when building local docs, useful for use with --doccmd:skip
1a0725f022