bundle libsqlite3.0.dylib for PPC Mac OS X

The libsqlite3 included with 10.4 is too old.
Revert "change the default colors a bit based on color-blindness feedback"

This reverts commit 3c439a773138ca86a3810de6a37912ff588f7d0e.

Instead of changing the default colors, add support for color
schemes and then use these colors as a starting point for a new
color scheme
add support for color schemes to the framework and use it in DrRacket
Fix TR unit tests

Was broken by d4963473adecf771a16f49120f00fd9296acc6ff
add for/X tests for multi-loop break
add for/X tests for outer-loop #:final condition

- make sure innermost loop is executed only one more time
add more for/X tests

- #:break and #:final in body with exprs in between
- both #:break and #:final
- skipped #:final
restore "native-pkgs" commit
add string-constants? and rearrange string-constants pkgs

the rearrangement moves the string constants documentation
into a package over by the string-constants implementation
and adds the string-constants (meta) pkg.
make the 'name field of color scheme be more forgiving
and improve the example in the docs to be more fool-proof
for copy/paste
make the example in the prefs dialog pick up the background color
more accurately
clean up get-current-color-scheme{-name}
Rearrange Redex tests
Start to test/implement proper named repeats.
More work on named repeats but without erasing non-repeats