Two transform tweaks:

* [Peach Request] AutoIK now respects axis locking (rotation locks).
- Temporary DOF-Locks are turned on for those bones that are part of an AutoIK chain while transforming. These locks get cleared after transforming.
- This works for all bones except the root bone of the chain, which doesn't seem to be able to be locked.

* Limit Location constraint can now optionally affect Translations too (i.e. NKEY panel values won't change). 
- LimitRot,LimitScale support (for their respective transforms) will be done at a later date
- This only works if the constraint is using World/Local space (the other spaces are not supported yet).
- I've added a temporary button in the LimitLoc panel to enable this option (it is disabled by default). This button will be properly assigned a place in that panel sometime.

source/blender/include/transform.h

@@ -45,6 +45,7 @@ struct Object;
 struct View3D;
 struct ScrArea;
 struct bPose;
+struct bConstraint;
 
 
 typedef struct NumInput {
@@ -142,6 +143,7 @@ typedef struct TransData {
     float  smtx[3][3];   /* Transformation matrix from global space to data space                          */
 	float  axismtx[3][3];/* Axis orientation matrix of the data                                            */
 	struct Object *ob;
+	struct bConstraint *con;	/* for objects/bones, the first constraint in its constraint stack */
 	TransDataExtension *ext;	/* for objects, poses. 1 single malloc per TransInfo! */
 	TransDataIpokey *tdi;		/* for objects, ipo keys. per transdata a malloc */
 	void *tdmir;		 /* mirrored element pointer, in editmode mesh to EditVert */