Move main library documentation pages into a new ManPages subdirectory.

LUFA/DevelopingWithLUFA

LUFA/ManPages/AboutLUFA.txt

LUFA/ManPages/Author.jpg

LUFA/ManPages/BuildingLinkableLibraries.txt

LUFA/ManPages/ChangeLog.txt

LUFA/ManPages/CompileTimeTokens.txt

LUFA/ManPages/DevelopingWithLUFA.txt

LUFA/ManPages/DeviceSupport.txt

LUFA/ManPages/DirectorySummaries.txt

LUFA/ManPages/Donating.txt

LUFA/ManPages/FutureChanges.txt

LUFA/ManPages/GettingStarted.txt

LUFA/ManPages/Groups.txt

LUFA/ManPages/LUFAPoweredProjects.txt

LUFA/ManPages/LibraryResources.txt

LUFA/ManPages/License.txt

LUFA/ManPages/MainPage.txt

LUFA/ManPages/MigrationInformation.txt

LUFA/ManPages/VIDAndPIDValues.txt

LUFA/ManPages/WritingBoardDrivers.txt