Improved table headers

- added captions/tooltips for EntryListModelAdapter
- removed (unused) fileView header
Added textual "kind" information to tooltip
Reading duration data
Displaying duration data
Storing sourceFile in entry

It was displayed but not set
Fixed: Now reading memory usage from XML correctly

Used wrong attribute name and overwrote on xml end element
Changed sourceFile to sourceFileId
Making context and file column sortable