notmuch: add bulk version of allmail::parse.

notmuch/src/lib.rs

@@ -480,7 +480,8 @@ impl Notmuch {
 
     pub fn show(&self, query: &str) -> Result<ThreadSet, NotmuchError> {
         let slice = self.run_notmuch(["show", "--format=json", query])?;
-        //
+        // Notmuch returns JSON with invalid unicode.  So we lossy convert it to a string here an
+        // use that for parsing in rust.
         let s = String::from_utf8_lossy(&slice);
         let mut deserializer = serde_json::Deserializer::from_str(&s);
         deserializer.disable_recursion_limit();