some browser bugfixes (image hotspot & marker, IE8 sql reports, ... )

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2691 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
document editmode: changed the way how drag & drop works in the iframe

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2692 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
document editmode: IE8 bugfixes

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2693 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
document tag image: allow relations in image hotspots & metadata

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2694 1f8fe7d8-47f0-464c-8d0a-336f4953ab05