add 'mfind' command, like 'find' with mu4e defaults

Add a command 'mfind' which follows the mu4e defaults, i.e.
--include-related, --skip-dups.

man/Makefile.am

@@ -1,4 +1,4 @@
-## Copyright (C) 2008-2017 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
+## Copyright (C) 2008-2019 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
 ##
 ## This program is free software; you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
@@ -32,4 +32,14 @@ dist_man_MANS =		\
 	mu-script.1	\
 	mu-verify.1     \
 	mu-view.1	\
-	mu.1
+	mu.1		\
+	$(BUILT_SOURCES)
+
+BUILT_SOURCES=		\
+	mu-mfind.1
+
+mu-mfind.1: mu-find.1
+	cp -f $< $@
+
+CLEANFILES=		\
+	$(BUILT_SOURCES)

man/mu-easy.1

@@ -296,6 +296,7 @@ Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
 .BR mu (1),
 .BR mu-index (1),
 .BR mu-find (1),
+.BR mu-mfind (1),
 .BR mu-mkdir (1),
 .BR mu-view (1),
 .BR mu-extract (1)

man/mu-find.1

@@ -4,6 +4,8 @@
 
 mu find \- find e-mail messages in the \fBmu\fR database.
 
+mu mfind \- find e-mail messages in the \fBmu\fR database with mu4e defaults.
+
 .SH SYNOPSIS
 
 .B mu find [options] <search expression>
@@ -13,6 +15,9 @@ mu find \- find e-mail messages in the \fBmu\fR database.
 \fBmu find\fR is the \fBmu\fR command for searching e-mail message
 that were stored earlier using \fBmu index\fR(1).
 
+\fBmu mfind\fR is a version of \fBmu find\fR that defaults to
+\f--include-related\fR and \fB--skip-dups\fR, just like \fBmu4e\fR does.
+
 .SH SEARCHING MAIL
 
 \fBmu find\fR starts a search for messages in the database that match
@@ -42,7 +47,7 @@ The search pattern is taken as a command-line parameter. If the search
 parameter consists of multiple parts (as in the example) they are
 treated as if there were a logical \fBand\fR between them.
 
-For details on the possible queries, see 
+For details on the possible queries, see