Fri, 23 Jun 2017 22:03:51 +0200 wenzelm indentation of keywords after input;
Fri, 23 Jun 2017 16:16:41 +0200 wenzelm indent = 0 for blank lines: produce less whitespace by default;
Fri, 23 Jun 2017 15:46:25 +0200 wenzelm clarified prev_line: stop at blank line;
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