also checked and fixed memory leaks caused by not deleting
SfxStyleSheetIterator instances.

Found by: Chao Huang
Patch by: Chao Huang
Review by: alg

(cherry picked from commit aee8221b)

Conflicts:
	sc/source/core/data/stlsheet.cxx
	sc/source/filter/xml/xmlfonte.cxx
	sfx2/source/doc/objcont.cxx
	svl/source/items/style.cxx
	sw/source/core/unocore/unostyle.cxx

Resolves: #120077# ALG: Reverted r1354011,

adapted all usages of SfxStyleSheetIterator and CreateIterator to use
boost::shared_ptr

(cherry picked from commit ec1819f2)

Conflicts:
	sc/source/core/data/stlsheet.cxx
	sc/source/filter/xml/xmlfonte.cxx
	sfx2/source/doc/objcont.cxx
	svl/inc/svl/style.hxx
	svl/source/items/style.cxx
	sw/source/core/unocore/unoframe.cxx
	sw/source/core/unocore/unostyle.cxx

26937d4d65562b14de0aea59a7b01cc4334f73c1

Change-Id: If99bf3ee399292ec269d68b36ee78ed63f033215