[master] Added ChangeLog entry for trac 900

ChangeLog

+232.	[func]      stephen
+	To facilitate the writing of extended descriptions in message files,
+	altered the message file format.  The message is now flagged with a "%"
+	as the first non-blank character in the line and the lines in the
+	extended description are no longer preceded by a "+".
+	(Trac #900, git b395258c708b49a5da8d0cffcb48d83294354ba3)
+
 231.	[func]*
 	The logging interface changed slightly. We use
 	logger.foo(MESSAGE_ID).arg(bar); instead of logger.foo(MESSAGE_ID, bar);