— part of check-in
on branch trunk
* 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
* 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.