Big docs cleanup.

* Fixed headers including:
  - All rights reserved not All Rights Reserved.
  - name, [email protected] not name <[email protected]>
  - tabs and spaces
  - Authors: not Documented by:
* Renamed string.dox to String.dox
* Renamed midixxx.dox files to MidiXxx.dox
* Moved images into images subdirectories and updated Doxfile.
* Re-format all files with tabs instead of spaces.
* Fix many spelling mistakes.
* Added all files, classes, structs, and enums to libbe group.

docs/user/storage/Directory.dox

@@ -7,6 +7,7 @@
  *		Ingo Weinhold, [email protected]
  *		Axel Dörfler, [email protected]
  *		John Scipione, [email protected]
+ *
  * Corresponds to:
  *		headers/os/storage/Directory.h  hrev43528
  *		src/kits/storage/Directory.cpp  hrev43528
@@ -15,6 +16,8 @@
 
 /*!
 	\file Directory.h
+	\ingroup storage
+	\ingroup libbe
 	\brief Provides the BDirectory class.
 */