Added 'prefix' option to <property>. Designed to only work when loading a property file or resource.

Sorry for the multiple commits - got a lock error when trying all files at once


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@271520 13f79535-47bb-0310-9956-ffa450edef68

WHATSNEW

@@ -179,6 +179,9 @@ Other changes:
   
 * <propertyfile>'s <entry> now has a 'unit' attribute to specify the
   increment/decrement unit on date operations.
+  
+* <property> now supports a 'prefix' attribute when loading from a file
+  or resource.
 
 Changes from Ant 1.4 to Ant 1.4.1
 ===========================================