Switch to side-by-side view

--- a/.hgignore
+++ b/.hgignore
@@ -38,6 +38,7 @@
 src/doc/user/rcl.program.fields.html
 src/doc/user/rcl.program.html
 src/doc/user/rcl.search.anchorwild.html
+src/doc/user/rcl.search.casediac.html
 src/doc/user/rcl.search.commandline.html
 src/doc/user/rcl.search.complex.html
 src/doc/user/rcl.search.custom.html