mu: move mu/mu/tests, lib/tests one level up

Makes it easier to generator code-coverage reports

lib/testdir4/mail1

@@ -0,0 +1,38 @@
+Date: Thu, 31 Jul 2008 14:57:25 -0400
+From: "John Milton" <jm@example.com>
+Subject: Fere libenter homines id quod volunt credunt
+To: "Julius Caesar" <jc@example.com>
+Message-id: <3BE9E6535E3029448670913581E7A1A20D852173@emss35m06.us.lmco.com>
+MIME-version: 1.0
+x-label: Paradise losT
+X-keywords: john, milton
+Content-type: text/plain; charset=us-ascii
+Content-transfer-encoding: 7BIT
+Precedence: high
+
+OF Mans First Disobedience, and the Fruit
+Of that Forbidden Tree, whose mortal tast
+Brought Death into the World, and all our woe,
+With loss of Eden, till one greater Man
+Restore us, and regain the blissful Seat, [ 5 ]
+Sing Heav'nly Muse,that on the secret top
+Of Oreb, or of Sinai, didst inspire
+That Shepherd, who first taught the chosen Seed,
+In the Beginning how the Heav'ns and Earth
+Rose out of Chaos: Or if Sion Hill [ 10 ]
+Delight thee more, and Siloa's Brook that flow'd
+Fast by the Oracle of God; I thence
+Invoke thy aid to my adventrous Song,
+That with no middle flight intends to soar
+Above th' Aonian Mount, while it pursues [ 15 ]
+Things unattempted yet in Prose or Rhime.
+And chiefly Thou O Spirit, that dost prefer
+Before all Temples th' upright heart and pure,
+Instruct me, for Thou know'st; Thou from the first
+Wast present, and with mighty wings outspread [ 20 ]
+Dove-like satst brooding on the vast Abyss
+And mad'st it pregnant: What in me is dark
+Illumin, what is low raise and support;
+That to the highth of this great Argument
+I may assert Eternal Providence, [ 25 ]
+And justifie the wayes of God to men.