Upper case HOWTO and TODO (POSTAGE-23)

git-svn-id: https://svn.apache.org/repos/asf/james/postage/trunk@1350146 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/doc/howto.txt b/doc/HOWTO
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rename from doc/howto.txt
rename to doc/HOWTO
diff --git a/doc/todos.txt b/doc/TODO
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rename from doc/todos.txt
rename to doc/TODO