cpukit: Doxygen group fixes and many warnings addressed

The output of the modules.html is much improved. Most
filesystem and POSIX API related groups are properly nested.
Some formatting issues were addressed as were multiple
inconsistencies.

cpukit/libmisc/mouse/mouse_parser.h

@@ -1,9 +1,6 @@
 /**
  * @file rtems/mouse_parser.h
  *
- * @defgroup libmisc_mouse Mouse Parser Engine
- *
- * @ingroup libmisc
  * @brief Initialize Mouse Parser Engine
  *
  * This file is the header file for the Mouse Parser Engine.
@@ -42,13 +39,11 @@
 #include <rtems/mw_uid.h>
 
 /**
- *  @defgroup libmisc_mouse Mouse Support
- *  @ingroup libmisc
- *
  *  @defgroup libmisc_mouseparser Mouse Parser Engine
  *  @ingroup libmisc_mouse
  */
 /**@{*/
+
 #ifdef __cplusplus
 extern "C" {
 #endif