POSIX shell parser: add parameter expansion inside double-quotes.
POSIX shell parser: parsing improvements + more tests
Shell Parser tests: extract tests to a stand-alone file
Object-Utils: add IsBoolean/VerifyBoolean functions
POSIX shell parser: minor improvements to backticks/parameter-expansion
Shell-Descriptor: major rewrite + tests
more PLANS/TODO/HACKING information
Two helper scripts: describe and parse
Shell-Descriptor: re-organize code, expand comments.

No change in functionality.
more PLANS
Shell parser: add support for Compound-Commands in subshell

Example:
   seq 10 | ( sed -u 1q ; sort -nr )
POSIX Shell: implement compound commands in current shell

example:
  false && { echo failed >&2 ; exit 1; }
tests: add more tests for compound commands