Change log for ttester-xf.fs xtester.fs, xftester.fs,
ftester.fs, xfester.fs, ttester-xf-test.fs, and
ttester-xfarray-test.fs.

Unattributed changes are by David N. Williams.  Revision dates
in the above files may reflect cosmetic changes not recorded
here.

Version 1.3.1
31Jan11 * Adjusted array indices to zero base, suggested by
	  Krishna Myneni.
 1Feb11 * Added a workaround in one of the tests for what
	  appears to be a 1 ulp decimal conversion
	  discrepancy between pfe/gforth and IFORTH.
 5Feb11 * Revised stack effect comments for zero base index.

Version 1.3.0
17Jan11 * Former ttester-xf.fs renamed as a xftester.fs; 
	  ttester-xf.fs is now a consolidation of xftester.fs,
	  xtester.fs, and ftester.fs into one file.
	* Extracted xtester-errors.fs and ftester-errors.fs from
	  ttester-xf-test.fs.
	* Added Krishna Myneni's FT-REL0= and SET-FT-MODE-REL0
	  to ftester and ttester-xf, with tests in
	  ttester-xf-test.
31Jan11 * Wordsmithing, including clarification of PUBLIC and
	  PRIVATE.

Version 1.2.1
29Nov10 * Fixed compensating bugs in FT-REL= and FT-A<>.  Each
	  reversed the order of measured and reference values.
	* Updated FT-A<> in ttester-xfarray-test.
	* Added test for correct order of FT-REL= inputs in
	  ttester-xf-test, and for correct order of results and
	  goals with SET-FT-MODE-REL.
30Nov10 * Made initial ?.CR in ttester-xf-test and
	  ttester-xfarray explicit, no longer in tester-display.
 3Dec10 * Moved to public interface:  FT-DATUM= FT-ABS= FT-REL=
	  FT-AREL=
 5Dec10 * Replace a -> in ttester-xf-test by F->.
 7Dec10 * Fixed two cases in ttester-xf-test where DEPTH should
	  have been FDEPTH in exception tests.

Version 1.2.0
21Nov10 * Significant update.  Bumped all version numbers to
	  1.2.0.
	* New fp comparisons, suggested by Krishna Myneni,
	  in ftester.
22Nov10 * Updated ttester-xf-test and ttester-xfarray-test and
	  added tests for new words.  More elaborate error
	  reporting example in ttester-xf-test uses
	  FT-ERROR-INDEX.

Version 1.0.2
30Oct10 * Extracted xtester.fs from ttester-xf.fs.
	* Replaced [TTUNDEF] by [UNDEFINED].
	* Changed from headless to counted array format.
	* Added XT-GOALS array.
31Oct10 * Extensive renaming, for consistency and uglification.
	  The user interface remains compatible with ttester
	  except for user-defined error reporting.
	* Made separate error words for the data stack.
	* Redid xarray tests in ttester-xfarray-test.fs.
	* Extracted ftester.fs from ttester-xf.fs.
	* Did fp revisions analogous to x revisions.
 1Nov10 * Passed ttester-xfarray-test.
	* Redid ttester-xf.fs, now just a driver that defines
	  VERBOSE and TESTING, loads xtester.fs and ftester.fs,
	  and defines T{, ->, and }T as composites.
	* Redid ttester-xf-test.fs, including new goals arrays.
	* Added array printing words XT-A. and FT-A. to
	  ttester-xf-test.fs, used there in example
	  error-reporting words to display results and goals.
	* Tests passed.
 2Nov10 * Added array overrun tests for XT-A! and FT-A!.
	* Revised commentary.
 8Nov10 * Fixed several typos. 
16Nov10 * Removed explicit color display support in
	  ttester-xfarray-test and ttester-xf-test and included
	  tester-display.fs.

Version 1.0.1
20Sep10 * F2DUP and F2DROP conditionally compiled, iForth
	  defines them.

Version 1.0.0
09Feb10 * Preliminary start from gforth cvs version 1.1.6 of
          ttester.fs.
21Aug10 * Separated ttester-xf prototype from ttester.
29Aug10 * Removed integrated stack support.
        * Factored error reporting to uncouple data and fp
          stacks.
        * Vectorized FNEARLY=.
30Aug10 * Made factors for data and fp initial and result
          arrays.
        * Added array bounds checks.
31Aug10 * Complete rewrite.
01Sep10 * Prototype for ttester-xf-test.fs.
02Sep10 * Extracted array tests into ttester-xfarray-test.fs.
	* Added more F tests.
03Sep10 * Added exception and error tests.
        * Made separate X words for the data stack, and
          orthogonal X and F sections.  Defined T{ -> }T as
          combinations of X and F.
        * Added tests for FNEARLY= vector.
05Sep10 * Tested downward compatibility with ttester, revised
          commentary.
06Sep10 * Tweaked, tests passed with gforth, pfe, and iForth.  
	* Released.
07Sep10 * Added comments to F-> and }F.