Anagram: Remove bad words from the list.
Parcelforce: Skip queries that start with ISBN.

Also added a check if `$parcel_number` exists in the first place.
refactor of #543
Merge pull request #542 from gdrooid/anagram-words

Anagram: Remove bad words from the list.
Merge pull request #544 from duckduckgo/pr/543

Extension of #543