Merge branch 'lt/pretty-expand-tabs'

When "git log" shows the log message indented by 4-spaces, the remainder of a line after a HT does not align in the way the author originally intended. The command now expands tabs by default in such a case, and allows the users to override it with a new option, '--no-expand-tabs'. * lt/pretty-expand-tabs: pretty: test --expand-tabs pretty: allow tweaking tabwidth in --expand-tabs pretty: enable --expand-tabs by default for selected pretty formats pretty: expand tabs in indented logs to make things line up properly