Document namespace dealii.

git-svn-id: https://svn.dealii.org/trunk@15911 0785d39b-7218-0410-832d-ea1e28bc413d

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+/**
+ * This is the namespace in which everything in deal.II is in. To avoid
+ * prefixing every class and function call with dealii::, the @ref Tutorial
+ * therefore have a <code>using namespace dealii;</code> at the top of the
+ * code.
+ *
+ * In this documentation, the namespace prefix is suppressed for brevity.
+ */
+namespace dealii
+{
+}