[NTOS:CC] Avoid some magic numbers.

[NTOSKRNL] Bring an initial (and not perfect ;-)) implementation of read ahead to our Cc!

This halfplements CcScheduleReadAhead() which is responsible for finding the next reads
to perform given las

[NTOSKRNL] Bring an initial (and not perfect ;-)) implementation of read ahead to our Cc!

This halfplements CcScheduleReadAhead() which is responsible for finding the next reads
to perform given last read and previous reads. I made it very basic for now, at least
to test the whole process.
This also introduces the CcExpressWorkQueue in the lazy writer which is responsible
for dealing with read ahead items and which is dealt with before the regular queue.
In CcCopyData(), if read was fine, schedule read ahead so that it can happen in background
without the FSD to notice it! Also, update the read history so that scheduling as a
bit of data.
Implement (à la "old Cc" ;-)) CcPerformReadAhead() which is responsible for performing
the read. It's only to be called by the worker thread.

Side note on the modifications done in CcRosReleaseFileCache(). Private cache map
is tied to a handle. If it goes away, private cache map gets deleted. Read ahead
can run after the handle was closed (and thus, private cache map deleted), so
it is mandatory to always lock the master lock before accessing the structure in
read ahead or before deleting it in CcRosReleaseFileCache(). Otherwise, you'll
just break everything. You've been warned!

This commit also partly reverts f8b5d27.

CORE-14312

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[NDK] Update the PRIVATE_CACHE_MAP structure to match W2K3 one.
Also update the spin lock on allocation.

[NDK] Add DEFERRED_WRITE structure for Cc. CORE-14235

Consistently use CSHORT for NodeTypeCode/NodeByteSize while we're at it.

Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers into modules, and delete rossubsys.

Create the AHCI branch for Aman's work

svn path=/branches/GSoC_2016/AHCI/; revision=71203