- Mutex->LastWaiting was never reset to NULL, hence could point to
  a thread on the active queue, causing corruption.
HEADDESK, HEADDESK, HEADDESK
- Also, fixed lack of LEAVE macros in some parts of binary.c
- Fixed a typo in EXT2 directory handling (write)

- Added nestable SHORTLOCK using CMPXCHG

- How the **** did I stuff up those header guards?

- Also improved return behavior

- Opaque Data Structures and Objects
- Started on control structures

Also fixing some more Yield() calls

- Also stopped VM8086 from busy polling

- Darn, there's still a requirement for proc.asm to know the structure
  of tThread

- As a side effect, There are FAR less calls to Threads_Yield around,
  most have been replaced with Threads_Sleep and a wake on message.
- Also fixed a minor logging bug in PCI

- LOCK, TIGHTLOCK and VTIGHTLOCK have been removed
- Replaced by SHORTLOCK and Mutex_Acquire
 > SHORTLOCK disables interrupts and busy polls the lock waiting for other CPUs
 > Mutex_Acquire puts the thread to sleep if the lock is in use, and is given the
   lock when woken.

- Also, misc work on SpiderScript