This egg maintains the wrapper paradigm of the upstream source, using
(*-chicken.scm) as wrappers that contain Chicken-specific code.  This
eases syncing with upstream. 

However there are a couple differences to note:

- All wrappers (*-chicken.scm) are modified to use the CHICKEN 5
module system instead of the Chicken 3 export style.

- fmt-unicode-chicken.scm is not a wrapper because the source is a not a wrapper.

- test-fmt.scm, test-fmt-c.scm: replace (load "fmt-chicken.scm") with (use fmt)

- Compiled version of mantissa+exponent is disabled because it returns
  erroneous results and causes many test failures.


Patches applied to upstream 0.7 are in diffs/:

 00-fmt-wrap.diff.txt              wrap-lines: Do not throw error for whitespace-only string
 01-fmt-last-padding.diff.txt      columnar: Remove pad skip optimization for last column so pad char takes effect (maybe reinstate if pad char is space?)
 02-fmt-one-column.diff.txt        columnar: Do not treat 100% width as fixed width 1
 03-test-fmt.diff.txt              Update and add tests for patches 00,01,02
 04-wrap-lines-break-fix.diff.txt  wrap-lines: fix argtype error for certain combos of long lines and wrap width; add test
 05-unicode-columnar.diff.txt      wrap-lines, justify: handle fmt-unicode; fix divby0 bug in justify