input.Makefile: Staging tables installation: Don't delete %/header.csv on error, because header.csv is a byproduct rather than the primary output and is created roughly atomically

schemas/vegbien.sql: *_ancestor tables: Added descriptive comment that these are ancestor cross link tables

csvs.py: sniff(): Support multi-char delims using \t, such as \t|\t used by NCBI. Support custom line suffixes, such as \t| used by NCBI.

csvs.py: TsvReader.next(): Remove only the autodetected line ending instead of any standard line ending. Note that this requires all header override files to use the same line ending as the CSV they override, which is now the case.

csvs.py: is_tsv(): Support multi-char delimiters by checking only the first char of the delimiter

csvs.py: sniff(): Also autodetect the line ending

csvs.py: sniff(): Also autodetect the line ending

inputs/test_taxonomic_names/Taxon/+header.txt: Changed line endings to \r\n to match testNames.txt line endings. This will be necessary when the line ending is autodetected by csvs.sniff().

csvs.py: TsvReader.next(): Renamed raw_contents var to line, since this is just the line with the ending removed

strings.py: Replaced no longer used contains_any() with find_any(), which returns any found substring, or None if none of the substrings were found