[O] Compatibility tests

[Achim Gratz]

I've found out what prevented my Emacs 23 from working and I can finally
test all relevant GNU Emacsen.  Here's the compile / test matrix (row:
Emacs used to compile Org, column: Emacs used to run test).  Recorded
are the number of passed tests and total tests run.  I have all Babel
languages with tests activated and the new exporter is not made
available.

| compile \ test | 22.3         | 23.3        | 23.4        | 24.2    | 24.2.91 
| 24.3.50 |
|----------------+--------------+-------------+-------------+---------+---------+---------|
|           22.3 | 235/247 [1]  | 360/361 [2] | 360/361 [2] | 364/364 | 364/364 
| 364/364 |
|           23.3 | incompatible | 360/361 [2] | 360/361 [2] | 364/364 | 364/364 
| 364/364 |
|           23.4 | incompatible | 360/361 [2] | 360/361 [2] | 364/364 | 364/364 
| 364/364 |
|           24.2 | incompatible | 360/361 [2] | 360/361 [2] | 364/364 | 364/364 
| 364/364 |
|        24.2.91 | incompatible | 360/361 [2] | 360/361 [2] | 364/364 | 364/364 
| 364/364 |
|        24.3.50 | incompatible | 360/361 [2] | 360/361 [2] | 364/364 | 364/364 
| 364/364 |

[1] 12 unexpected results:
   FAILED  ob-exp/evaluate-all-executables-in-order
   FAILED  ob-exp/export-call-line-information
   FAILED  ob-exp/exports-both
   FAILED  ob-exp/exports-inline
   FAILED  ob-exp/mixed-blocks-with-exports-both
   FAILED  ob-exp/noweb-no-export-and-exports-both
   FAILED  ob-exp/noweb-on-export
   FAILED  ob-exp/noweb-on-export-with-exports-results
   FAILED  test-org-table/empty-field
   FAILED  test-org/beginning-of-line
   FAILED  test-org/comment-dwim
   FAILED  test-org/end-of-line

[2] 1 unexpected results:
   FAILED  test-ob-sh/session


Emacs 22 cannot run from files byte-compiled with a later version due to
some compile-time decisions and UTF-8 characters in the following files:
org-bibtex.elc, org-clock.elc, org-entities.elc, org-inlinetask.elc,
org-latex.elc, org-taskjuggler.elc.  These are compiled as multi-byte
characters in Emacs 22.


XEmacs compatibility is broken at the moment: XEmacs does not have
declare-function and the 5-argument form of load.  I'll test if that can
be worked around via a defalias or defmacro and also if I can get ert to
work in batch-mode at least.



Regards,
Achim.
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