More consistency with SeaweedFS name

Among the changes, this replaces a couple instances of "Seaweed File System"
with "SeaweedFS", for the same reason that nobody says "Mongo Data Base".

go/weed/version.go

@@ -10,8 +10,8 @@ import (
 var cmdVersion = &Command{
 	Run:       runVersion,
 	UsageLine: "version",
-	Short:     "print Seaweed File System version",
-	Long:      `Version prints the Seaweed File System version`,
+	Short:     "print SeaweedFS version",
+	Long:      `Version prints the SeaweedFS version`,
 }
 
 func runVersion(cmd *Command, args []string) bool {