Make a number of variables 'unsigned' to avoid warnings about comparing signed and unsigned quantities.
Make a number of variables 'unsigned' to avoid warnings about comparing signed and unsigned quantities.

git-svn-id: 31d9d2f6432a47c86a3640814024c107794ea77c@15847 0785d39b-7218-0410-832d-ea1e28bc413d

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