Bats-core Files

Added:

• add installation instructions for Debian, Fedora, Gentoo, and OpenSUSE (#659)
• add --line-reference-format to switch file/line references in stack traces (#665)
• comma_line (default): file.bats, line 1
• colon: file.bats:1
• uri: file:///path/to/file.bats:1
• custom: define your own formatter in bats_format_file_line_reference_custom
• add bats:focus tag to run only focused tests (#679)
• add bats-support, bats-assert, bats-file and bats-detik to Dockerfile (#674)

Documentation:

• add --help text and man page content for --filter-tags (#679)

Fixed:

• explicitly check for GNU parallel (#691)
• wait for report-formatter to finish before ending bats' execution, to fix empty files with --report-fomatter junit under Docker (#692)

Documentation

• improved clarity of section about output in free code (#671)
• fixed typos (#673)
• clarify use cases of run (#366)