Don't normalize away last component in a component name that has dots.

Note: previous commit to u-defpackage was unrelated to specified message.

Functionalize a few macros,
make constituent designators slightly more readable,
fix a typo,
fix a compiler warning in a test.

  - Added instrumentation for #. and #S
  - Potentially dangerous heuristics for defvar and defconstant
  - Improved handler for defstruct
  - New unit tests
  - Some cleanup of old code

 * Better recognition of just about everything.
 * Lots of bug fixes.
 * Make it easier to drop in user-provided handler definitions in the
   handlers/ directory.

occurrences of them