Delete old no longer used Danish dis files
Updated Danish 6 dot, 8 dot grade1 grade2 tables

As submitted by Bue Vester-Andersen

results from test harness:

da-dk-g16-dictionary:
Ran 237375 tests (100.0% success), with 8 failures and 0 errors.

da-dk-g18-dictionary:
Ran 239203 tests (100.0% success), with 0 failures and 0 errors.

da-dk-g26-dictionary:
Ran 236456 tests (99.9% success), with 240 failures and 0 errors.

da-dk-g28-dictionary:
Ran 237795 tests (99.89% success), with 263 failures and 0 errors.
Update news
Merge branch 'bvandersen-danish'

* bvandersen-danish:
  Update news
  Updated Danish 6 dot, 8 dot grade1 grade2 tables
  Delete old no longer used Danish dis files