add test file for reST HL
add test file for reST HL

Add an example reStructuredText file for testing the respective HL. This
covers most of the changes and fixes made in the recent series of
changes to rest.xml.

DickJ/kate,sandsmark/kate,jfmcarreira/kate,sandsmark/kate,hlamer/kate,DickJ/kate,DickJ/kate,cmacq2/kate,hlamer/kate,sandsmark/kate,cmacq2/kate,hlamer/kate,hlamer/kate,hlamer/kate,hlamer/kate,hlamer/kate,hlamer/kate,cmacq2/kate,hlamer/kate,jfmcarreira/kate,jfmcarreira/kate,hlamer/kate,sandsmark/kate,DickJ/kate