Make POS lists on new projects use GOLD Etic guids

* Add guids to PartOfSpeech elements in POS.xml template
* Change the loading code to use the guids from the file
  when creating PartOfSpeech possibilities.
* Test that template contains guids for each item
* Test that POS.xml template agrees with the GOLDEtic

Change-Id: Ia514d3ddfe7a6720b29d6b25d17162d8da7f24c1