iash version 0.2 "Firmament" stable.

Shell debugger now uses $IASH_DEBUG_ACTIVE to change the prompt.

All environment management uses the `env` command in the shell debugger
now. Added the ability to save/load the environment via shell debugger.

Cleaned up shell debugger, moved arguments from commands that performed
similar functions (e.g. setting things) into the same command.

Fixed crash issues with calls to the command not found functions.

Added a function to test if an environment variable exists (case
insensitive) and a function to convert any text into all caps for
environment variables.