Use "!=" in preference to "~=" everywhere in code. * expr.txi: Combine two lines for clarity. * ov-fcn-handle.cc (make_fcn_handle): In BIST test, put test for "!=" ahead of test for "~=" to indicate desirability. * lex.ll: List "!=" CMD_OR_OP before "~=" to indicate desirability. * compare_versions.m: Combine @item entries for "!=" and "~=" as they both represent "not equal".

--- a/doc/interpreter/expr.txi	Tue Jan 21 19:52:17 2020 +0100
+++ b/doc/interpreter/expr.txi	Tue Jan 21 11:16:33 2020 -0800
@@ -1550,8 +1550,7 @@
 @samp{:}
 
 @item relational
-@samp{<} @samp{<=} @samp{==} @samp{>=} @samp{>} @samp{!=}
-@samp{~=}
+@samp{<} @samp{<=} @samp{==} @samp{>=} @samp{>} @samp{!=} @samp{~=}
 
 @item element-wise "and"
 @samp{&}