fixes for gpg.py extension - add copyright and license - add i18n - add 'sigs' command behaving like 'hg tags' - change 'role' to 'comment' and output it only if there is one - refactoring

abort: Failed to parse .../t/.hg/hgrc
File contains no section headers.
file: .../t/.hg/hgrc, line: 1
'invalid\n'