Adding fullSEED test files with non-D dataquality.
Adding test for the reading fullSEED files with non-D dataquality.
Fixing the issue with reading fullSEED files.

Now all fullSEED files should be read correctly. The issue was that the
first data record in fullSEED files previously must have had the
dataquality D. Now all valid dataqualities are allowed.
Merge pull request #676 from krischer/fix_fullseed_reading_issue

Fix fullseed reading issue