. made many casts explicit to avoid warnings on MSVC7, and changed a few types for more coherence

. minor changes


[SVN r27510]

libs/format

@@ -1 +1 @@
-Subproject commit e1c99d5351e71b07cf05c66d6597d9adc22c126a
+Subproject commit 20f2d3405db6e9b4b99a0652dcf8fbb178430d1c