Add front/main/backmatter styles to JLReq layout

lib/examples/ja/Articles/Japanese_Article_%28JLReq_Class%29.lyx

@@ -2340,7 +2340,22 @@ appendix_
 \end_inset
 
 に変えることによって，
-本文部分／後付け／付録に関する設定に変えることができます．
+本文部分／後付け／付録に関する設定に変えることができます（これらは
+\begin_inset Flex MenuItem
+status collapsed
+
+\begin_layout Plain Layout
+\begin_inset Info
+type  "l7n"
+arg   "Japanese Book (JLReq Class)"
+\end_inset
+
+
+\end_layout
+
+\end_inset
+
+でのみ使用することができます）．
 \end_layout
 
 \begin_layout Itemize

lib/layouts/jlreq-book.layout

@@ -20,3 +20,43 @@ Input jlreq-common.inc
 ClassOptions
 	Other	book
 End
+
+Style Front_Matter
+	Category             Structure
+	LatexType            Command
+	LatexName            frontmatter
+	KeepEmpty            1
+	ResetArgs            1
+	Margin               First_Dynamic
+	NextNoIndent         1
+	ParSkip              0
+	TopSep               2.5
+	BottomSep            0.5
+	ParSep               0
+	Align                Center
+	LabelType            Static
+	LabelBottomSep       0
+	LeftMargin           M
+	LabelString          "--- Front Matter ---"
+
+	Font
+	  Family             Sans
+	  Series             Bold
+	  Size               Largest
+	  Color              textlabel1
+	EndFont
+End
+
+Style Main_Matter
+	CopyStyle            Front_Matter
+	Category             Structure
+	LatexName            mainmatter
+	LabelString          "--- Main Matter ---"
+End
+
+Style Back_Matter
+	CopyStyle            Front_Matter
+	Category             Structure
+	LatexName            backmatter
+	LabelString          "--- Back Matter ---"
+End

lib/layouts/jlreq-common.inc

@@ -1,5 +1,5 @@
 # Japanese jlreq textclass definition file.
-# Author : Koji Yokota (yokota6@gmail.com)
+# Author : Koji Yokota (yokota@lyx.org)
 #
 # This class internally loads following packages:
 # Any time:          l3keys2e, lmodern
@@ -90,7 +90,7 @@ End
 
 Style Abstract_over_Columns
 	CopyStyle            Abstract
-	InPreamble			1
+	InTitle              1
 	LabelString          "Abstract"
 	Category             FrontMatter
 	LatexType            Command