+- layout l1 for a column of max text width 3 reduces the following
+ inter-column spacing for groff, but not for mandoc
+ net/lftp(1) from jirib via bentley@ Sep 13, 2016
+
+- the "w" layout option is ignored
+ synaptics(4) found by tedu@ Mon, 17 Aug 2015 21:17:42 -0400
+ loc * exist * algo * size * imp **
+
+- the "s" layout column specifier is used for placement of data
+ into columns, but ignored during column width calculations
+ synaptics(4) found by tedu@ Mon, 17 Aug 2015 21:17:42 -0400
+ loc * exist ** algo *** size * imp **