Integration of XSS-NG.

Use of Generics for ColumnDataModel, and insertion of classes needed:
jsoup and diff from fraser/neil package, MultiLineString
Merge branch 'locks-fix' into xssng-port
Revert "FIX: Better handling of selected conversations in SummaryPanel to avoid errors."

This reverts commit 25598648ae19eb81b0269ba1cb12d0e607f97145.