[REVIEW 3-6] acclerate large OLE2 file reading ...

[Michael Meeks]

	This reasonably trivial fix accelerates a large (private) PivotTable
document load from 100seconds down to 20 seconds for me. It dungs out a
chunk of code - I'm doing some more aggressive cleanup on master - to
not hold the entire OLE2 stream in allocated memory while reading ;-)
[ sadly we still do that while writing until 'Commit' ] - but this is
the simpler version for 3-6.

	Review / acks appreciated - it passes 'make check' and some
smoke-testing of load/save big PPT files.

	HTH,

		Michael.

-- 
michael.meeks at suse.com  <><, Pseudo Engineer, itinerant idiot
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