officers/private

* Renamed 'ehandler' to intercept. Documented the change. Kept the old
  name around, deprecated it.

* Renamed 'shandler' to custom-setup, and documented it. Extended the
  implementation to support a list of customizations, instead of a
  single.

* Fixed handling of *prefix* for --help. Code wrongly extended the
  local copy of the block, instead of the root copy.

Updated docs, change information.
Regenerated the embedded docs.