ProcessedContent is replaced by a list of ProcessedLine:
Now the breaking of "exact match", "text  before", "text after" is for every line in the content.
Bugfix: The previous way for current text into stubs is incorrect.
Bugfix: The previous way for current text into stubs is incorrect.
Unittest changed to capture this bug.
priority_queue module added.
get_queue_size -> size
initialize_search_result and search_text_stream check in.