DocBook: floats can no more override DocBookTag.

This lead to a quite subtle bug. The major problem is that float tags
depend on whether the LyX float has a title (formal) or nor (informal).
This information cannot be encoded in the layout format as easily as a
simple DocBookTag.

src/Floating.cpp

@@ -30,7 +30,7 @@ Floating::Floating(string const & type, string const & placement,
 		   string const & listName, std::string const & listCmd,
 		   string const & refPrefix, std::string const & allowedplacement,
 		   string const & htmlTag, string const & htmlAttrib,
-		   docstring const & htmlStyle, string const & docbookTag,
+		   docstring const & htmlStyle,
 		   string const & docbookAttr, string const & docbookTagType,
            string const & required, bool usesfloat, bool ispredefined,
 		   bool allowswide, bool allowssideways)

src/Floating.h

@@ -37,7 +37,7 @@ public:
 		 std::string const & listName, std::string const & listCmd,
 		 std::string const & refPrefix, std::string const & allowedplacement,
 		 std::string const & htmlType, std::string const & htmlClass,
-		 docstring const & htmlStyle, std::string const & docbookTag,
+		 docstring const & htmlStyle,
 		 std::string const & docbookAttr, std::string const & docbookTagType,
 		 std::string const & required, bool usesfloat, bool isprefined,
 		 bool allowswide, bool allowssideways);

src/TextClass.cpp

@@ -1574,7 +1574,7 @@ bool TextClass::readFloat(Lexer & lexrc)
 		}
 		Floating fl(type, placement, ext, within, style, name,
 			listname, listcommand, refprefix, allowed_placement,
-			htmltag, htmlattr, htmlstyle, docbooktag, docbookattr,
+			htmltag, htmlattr, htmlstyle, docbookattr,
 			docbooktagtype, required, usesfloat, ispredefined,
 	        allowswide, allowssideways);
 		floatlist_.newFloat(fl);