templates of result strings
- prolog_template
- epilog_template
- doc_file_template
- doc_section_template
- doc_end_template
- metric_template
- relevance_template
- clot_head_template
- clot_break_template
- clot_tail_template
- passage_template
- highlighted_passage_template
- cruft_rx
- cruft_rx_is_case_sensitive
colors
- doc_name_color
- text_color
- occ_color
- head_tail_color