-reimplemented old style output (.exp, .out)

-implemented diff format output
-delete error logs on success
@Changed regression tests produce selectable error reports. The tests now
@recognize environment variable TEST_PHP_LOG_FORMAT which can
@contain O and E for old style .out and .exp files, L for new .log format and
@D for an internal diff format that does not require systems diff. (Marcus)
#diff output makes it easier to detect the failure on huge or combined tests.
#It was discussed that the php function's diff output has the advantage that
#it is available on every system. Everyone insisting on systems diff may
#use diff on .exp and .out files.

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