Creating testcases for pp2html/pp2latex:
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* Copy an existing t/test_xx.t file to a new t/test_yy.t
* Create a corresponding t/test_yy.pp File.
* Edit the t/test_yy.t file; replace all former 'xx'
with 'yy'
* The t/test_yy.t script extracts the number of headlines
in the t/test_yy.pp file. This determines the number of
tests ...
* insert what you want to test into the t/test_yy.pp file
* setenv PP_DEBUG 1
* perl t/test_yy.t
This creates the yy_*htm file which are not deleted due to
the setting of PP_DEBUG
* Rename the yy_*htm files to yy_*.ref and store them in
a corresponding d_yy directory
* DO NOT FORGET to update the MANIFEST file !!
* run `make test'
* Similar procedure for ltx_test files.