Restructure XML files to allow for V2 ISA. Work in progress.

	* features/arc-aux-baseline.v1.xml: Created.
	* features/arc-aux-baseline.v2.xml: Renamed from
	arc-aux-baseline.xml.
	* arc-aux-exception.v1.xml: Created.
	* arc-aux-exception.v2.xml: Renamed from arc-aux-exception.xml.
	* arc-aux-mpu.v2.xml: Renamed from arc-aux-mpu.xml.
	* arc-aux-smart.v2.xml: Renamed from arc-aux-smart.xml.
	* arc-aux-timer.v1.xml: Created.
	* arc-aux-timer.v2.xml: Renamed from arc-aux-timer.xml.
	* arc-core-basecase.xml: Renamed from arc-core.xml.
	* arc-core-linkregs.v1.xml: Created.
	* arc-core-linkregs.v2.xml: Likewise.
	* arc-core-other.xml: Likewise.
	* arc-core-pointers.xml: Likewise.
	* arc-core-reduced.xml: Likewise.
	* arc-reduced-core.xml: Remove pointer, link and "other"
	registers.
	* arc700.xml: Likewise.
Add missing ChangeLog entry for previous commit.

	* features/arc-aux-baseline.v1.xml: Created.
	* features/arc-aux-baseline.v2.xml: Renamed from
	arc-aux-baseline.xml.
	* arc-aux-exception.v1.xml: Created.
	* arc-aux-exception.v2.xml: Renamed from arc-aux-exception.xml.
	* arc-aux-mpu.v2.xml: Renamed from arc-aux-mpu.xml.
	* arc-aux-smart.v2.xml: Renamed from arc-aux-smart.xml.
	* arc-aux-timer.v1.xml: Created.
	* arc-aux-timer.v2.xml: Renamed from arc-aux-timer.xml.
	* arc-core-basecase.xml: Renamed from arc-core.xml.
	* arc-core-linkregs.v1.xml: Created.
	* arc-core-linkregs.v2.xml: Likewise.
	* arc-core-other.xml: Likewise.
	* arc-core-pointers.xml: Likewise.
	* arc-core-reduced.xml: Likewise.
	* arc-reduced-core.xml: Remove pointer, link and "other"
	registers.
	* arc700.xml: Likewise.