Add test-suite optional, order subincludes

[SVN r17016]

status/Jamfile

@@ -15,12 +15,14 @@ include testsuites.jam ;
 DEPENDS all : test ;
 
 # Tests from Jamfiles in individual library test subdirectories
-subinclude libs/filesystem/test ;
-subinclude libs/type_traits/test ;       # test-suite type_traits
+#  Please keep these in alphabetic order by test-suite name
+subinclude libs/filesystem/test ;        # test-suite filesystem
+subinclude libs/optional/test ;          # test-suite optional
 subinclude libs/regex/test ;             # test-suite regex
 subinclude libs/regex/example ;          # test-suite regex-examples
-subinclude libs/static_assert ;    # test-suite static_assert
+subinclude libs/static_assert ;          # test-suite static_assert
 subinclude libs/thread/test ;            # test-suite thread
+subinclude libs/type_traits/test ;       # test-suite type_traits
 
 # Tests specified in this Jamfile
 {