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* Two new low-level roff(7) features:Ingo Schwarze2018-04-101-1/+1
| | | | | | * .nr optional third argument (auto-increment step size) * \n+ and \n- numerical register auto-increment and -decrement bentley@ reported on Dec 9, 2013 that lang/sbcl(1) uses these.
* When accessing an undefined number register, define it to be zero, likeIngo Schwarze2018-04-091-1/+1
| | | | | | the previous commit for strings and macros, only technically simpler. Desired behaviour also mentioned by Werner Lemberg in 2011. This diff adds functionality but is -21 +19 LOC. :-)
* Finally port the OpenBSD regression suite.Ingo Schwarze2017-02-081-0/+6
Both kristaps@ and wiz@ repeated asked for this, literally for years.