journal, csv: comment lines can also start with *

As in Ledger. This means you can embed emacs org/outline-mode nodes in
your journal file and manipulate it like an outline.

doc/manual.md

@@ -383,7 +383,9 @@ P 2010/1/1 € $1.40
 
 #### Comments
 
-- A semicolon (`;`) or hash (`#`) in column 0 starts a journal comment line, which hledger will ignore.
+- A semicolon (`;`) or hash (`#`) or asterisk (`*`) in column 0 starts
+  a journal comment line, which hledger will ignore. (Asterisk allows you
+  to embed emacs org/outline-mode nodes and treat your journal like an outline.)
 
 - A semicolon after a transaction's description and/or indented on the following lines
 starts a transaction comment.

hledger-lib/Hledger/Read/CsvReader.hs

@@ -410,7 +410,7 @@ commentline :: Stream [Char] m t => ParsecT [Char] CsvRules m ()
 commentline = many spacenonewline >> commentchar >> restofline >> return () <?> "comment line"
 
 commentchar :: Stream [Char] m t => ParsecT [Char] CsvRules m Char
-commentchar = oneOf ";#"
+commentchar = oneOf ";#*"
 
 directive :: Stream [Char] m t => ParsecT [Char] CsvRules m (DirectiveName, String)
 directive = do

hledger-lib/Hledger/Read/JournalReader.hs

@@ -905,7 +905,10 @@ followingcommentp =
      return $ unlines $ samelinecomment:newlinecomments
 
 comment :: Stream [Char] m Char => ParsecT [Char] JournalContext m String
-comment = commentStartingWith "#;"
+comment = commentStartingWith commentchars
+
+commentchars :: [Char]
+commentchars = "#;*"
 
 semicoloncomment :: Stream [Char] m Char => ParsecT [Char] JournalContext m String
 semicoloncomment = commentStartingWith ";"