jsh/installation: rename jsh/runtime -> jsh/installation.

An installation tree is a better name than a runtime tree.

Signed-off-by: Jon Seymour <jon.seymour@gmail.com>
jsh/installation/resolved-packages: add support for 'jsh installation resolved-packages'

Signed-off-by: Jon Seymour <jon.seymour@gmail.com>
README.md: update readme for Feb 14, including:

* change to COPYING
* additional 'jsh installation' modules

Signed-off-by: Jon Seymour <jon.seymour@gmail.com>