updated copyrights to "Boost Software License, Version 1.0" on the few files that were still using the old one.

all the files are now under the new copyright.


[SVN r24612]

libs/format

@@ -1 +1 @@
-Subproject commit 7a521da638f3d85236137e3e19685940d215a706
+Subproject commit ebd3cc73638e1a7a226ffce734510c6af54a3e87