Introduce match-type column

The match-type column should show, what the type of a match is:

• a repetition
• a normal match
• a context match
• a MT match
  etc.

The filtering along-side the match-type is only possible in the match-type colum (which is hidden by default).

The Match-Rate column in turn should show a little icon which indicates the type of the match (as shown above). Please coordinate the icons with beo in advance.
In addition the match-rate column shows a tool-tip explaining showing the match-type.