Performance improvements in BizTalkTrackedMessagePartFragment
Performance improvements in BizTalkTrackedMessagePartFragment

 * If ImagePart is available we don't have to load the first
   fragment

 * Renamed SaveTo to WriteTo

 * Refactored get accessor of Fragments-property into own method

 * Made new LoadFragments method use yield

 * Allow streaming scenarios with near-constant memory usage
   of large (massive) messages using WriteTo and cacheFragments
   parameter

niik/DtaSpy