Improve comments. Improve check for over-/underflow in l2_norm slightly.
Improve comments. Improve check for over-/underflow in l2_norm slightly.

git-svn-id: 31d9d2f6432a47c86a3640814024c107794ea77c@27776 0785d39b-7218-0410-832d-ea1e28bc413d

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