Streamline the use of references in the doc
Streamline the use of references in the doc

- use opcoderef only when it makes sense. Where they are used with a
  redundant "opocde" remove that.
- try to move the references out of sentences, so it is easier to read
- try to group references

hammera/liblouis,BueVest/liblouis,liblouis/liblouis,BueVest/liblouis,hammera/liblouis,BueVest/liblouis,liblouis/liblouis,hammera/liblouis,liblouis/liblouis,liblouis/liblouis,hammera/liblouis,BueVest/liblouis,liblouis/liblouis,BueVest/liblouis,BueVest/liblouis,hammera/liblouis,hammera/liblouis,liblouis/liblouis