pdfwrite : Upgrading the default CompatibilityLevel to 1.4 .

Developers,

Please let me know if you have an objection for this patch.

[Log message beg]
pdfwrite : Upgrading the default CompatibilityLevel to 1.4 .
THIS IS INCOMPATIBLE CHANGE.

We believe that CompatibilityLevel=1.3 is now obsolete,
because most viewers can handle PDF 1.4 .
If an user needs to create a document for older viewers,
he should specify CompatibilityLevel explicitly.
Note that PDFSETTINGS parameter lists have been upgraded also.

EXPECTED DIFFERENCES :

None.
[Log message end]

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