This reverts commit 54a68969.

Conflicts:

	mcs/tools/xbuild/Parameters.cs

When a worker thread is looking for a job in the queue the collection
might already be over.  Don't call code that assumes it's still running
until we're sure.

Removed a number of warnings

This warning really pollutes the monodevelop build, so lets nuke it
for now.

Large projects now have significantly less overhead when calculating
assembly references and referencing gac assemblies.

Allow parsing of config files for for enterprise library.

This allows parsing of enterprise library config extensions and is in line with the way MS .net handles things.

Improved exception messages in case of configuration errors

Implemented DiscretionaryAcl and SystemAcl except for RemoveAccess

Implemented SystemAcl. Common shared functionality moved to CommonAcl. Only missing implementation now is RemoveAccess/RemoveAudit.

Unit tests included - for SystemAcl they are based on DiscretionaryAcl's mostly,
with one extra and one somewhat changed since AuditFlags merge together unlike Allow/Deny.

Anyway, it should be practical to implement CommonSecurityDescriptor and friends with these classes working.

Also fixed:
CommonAcl's merging now filters out AceFlags.InheritedFlags when !IsContainer.
For matching AccessMask, CommonAcl will now correctly merge ContainerInherit and ObjectInherit.
GenericAcl's SyncRoot is now virtual as per spec.
SecurityIdentifier.CompareTo throws ArgumentNullException, not NullReferenceException, on null parameter.

Miscellaneous unit tests:
Verify that RawAcl throws for negative capacity.

Needed to add more precise checking of dimensions on array initializers

Completely implemented System.Security.AccessControl.CommonAcl

Bug fix: Merging occurs after sorting ACE groups by SecurityIdentifier not before. Added a unit test for this behavior.

Also, fixed the namespace for the ObjectAce unit test.

and SystemAcl need work, but CommonAcl can be manipulated using RawAcls nicely
now and will test canonicity, merge ACEs, remove meaningless ACEs, sort explicit
deny/allow ACEs by SecurityIdentifier... all the nice things CommonAcl is supposed
to do.

Anyway, this patch... Off the top of my head...
Fixed CommonAce and ObjectAce deserialization/roundtripping with opaque data.
Fixed ObjectAce having the wrong BinaryLength depending on ObjectAceFlags.
GenericAce had two protected static SDDL methods which should be internal.

Added some unit tests for the above. One of the tests compares the binary
output with a blob I produced using the *same unit test* on MS.NET (with a
File.WriteAllText creating the byte array to paste in, naturally), and
happily, it produces identical binary output. Very nice.

SecurityIdentifier's CompareTo now works like MS.Net. CommonAcl is supposed to sort groupings of canonical ACEs using SecurityIdentifier's CompareTo, so this was important to do.

I determined the behavior of CompareTo by first writing unit tests for
CommonAcl (instantiated as DiscretionaryAcl but using RawAcl instead of
DiscretionaryAcl methods to do the manipulation to keep DiscretionaryAcl
out of the loop). I developed and ran these unit tests on MS.NET using
MonoDevelop...

Anyway, CompareTo appears to compare authority, then the *number* of
subauthorities, and lastly the subauthorities. I'd be curious if there
is more detail, but so far this seems to cover it. It's definitely
*not* just a comparison of the string.

This patch also modifies CommonAcl to take advantage of this new sorting,
so now it should sort groups of explicit ACEs (access deny, access allow)
in canonical ACLs correctly.

With that down, I've got two unit tests that still fail on Mono.

Some tests still fail because sorting is not implemented yet.
I'll need to alter SecurityIdentifier CompareTo.

	* sgen-conf.h: Introduce SGEN_DEFAULT_SAVE_TARGET_RATIO tunnable.

	* sgen-memory-governor.c: Fix allowance calculation to use the
	right size of the los space.