#55 Patch for defaultHandler in DTD

[Karl Waclawek]

This patch fixes the problem of having the default
handler called for DTD declarations, when a
designated handler is already provided.
Check bug #483514: "Default handler reports
handled events".

There is one limitation to this fix:
When there is an entityDeclHandler set, then
predefined and duplicate entity declarations will
be reported only partially by the default handler.
The reason is that at the time when it is detected
that the entity is a predefined one, or that the
declaration is a duplicate, part of the declaration
has already been reported. Example:
Instead of
<!ENTITY quot """>
the default handler will only report
quot"""
For details see the attached overview.

[Karl Waclawek]

Default handler patch

[Karl Waclawek]

Overview of default handler patch

[Karl Waclawek]

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Passed my own tests as well as the W3C test suite,
according to what we expect as a result. No change in
behaviour from release 1.95.4.

Therefore it seemed OK to apply the patch.