added table borders to the help page (JEditorPane before jre1.7 doesn't handle that css).
added table borders to the help page (JEditorPane before jre1.7 doesn't handle that css).

bigdataviewer/bigdataviewer-core,bogovicj/bigdataviewer-core,bigdataviewer/bigdataviewer-core,bogovicj/bigdataviewer-core