Fixed a problem where errors occurring during the parse phase of control
method execution did not abort cleanly.  For example, objects created
and installed in the namespace were not deleted.  This caused all
subsequent invocations of the method to return the AE_ALREADY_EXISTS
exception.

Implemented a mechanism to force a control method to "Serialized"
execution if the method attempts to create namespace objects.
(The root of the AE_ALREADY_EXISTS problem.)

Implemented support for the predefined _OSI "internal" control method.
Initial supported strings are "Linux", "Windows 2000", "Windows 2001",
and "Windows 2001.1", and can be easily upgraded for new strings as
necessary.  This feature allows Linux to execute
the fully tested, "Windows" code path through the ASL code

Global Lock Support:  Now allows multiple acquires and releases with any
internal thread.  Removed concept of "owning thread" for this special
mutex.

Fixed two functions that were inappropriately declaring large objects on
the CPU stack: ps_parse_loop() and ns_evaluate_relative().
Reduces the stack usage during method execution considerably.

Fixed a problem in the ACPI 2.0 FACS descriptor (actbl2.h) where the
S4Bios_f field was incorrectly defined as UINT32 instead of UINT32_BIT.

Fixed a problem where acpi_ev_gpe_detect() would fault
if there were no GPEs defined on the machine.

Implemented two runtime options:  One to force all control method
execution to "Serialized" to mimic Windows behavior, another to disable
_OSI support if it causes problems on a given machine.