owpreprocess: Add choice in FilteringModule for All Files (*) #334
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Issue
The FileWidget used in the FilteringModule class of owpreprocess allows opening files with a .txt extension only. The stopwords files included with the nltk_data do not have this extension. So these files nor any other files lacking a .txt extension can be selected as files for Stopwords or Lexicons.
Fixes #333.
Description of changes
This change adds a selector for "All files" in addition to "Only text files" in the FileWidget creation for the FilteringModule class.
The documentation describes creating files from scratch with a .txt extension, which is still appropriate, so no documentation changes are needed. No tests cover the FileWidget dialogs used by the FilteringModule.
Includes