Stage two of the giant animation recode project; Ipo/Action/NLA cleanup

-> Note; added 2 new c files (split editipo.c). MSVC needs upgrade.

Impatient people can check the goodies in CMS:
http://www.blender3d.org/cms/Action_and_NLA_editor.706.0.html

Most work was on trying to unwind the spaghetti for editing ipos. Too much
history and bad design got added here. Most evident changes:
- made generic 'context' for detecting which Ipo is being edited, or to
  assign ipos or to retrieve ipo curves.
- made generic insertkey() for all ipo types, including actions
- shuffled a lot of code around to make things more logical. Also made
  sure local functions are not exported

It is far from ready... when action/nla was added in Blender, a lot of
duplicate code was generated. That's for another time.

Now the goodies;
- made Actions to allow any Ipo type
- made NLA to define active actions, for Action window too
- corrected timing for active action, so it shows the 'real time', as
  defined in NLA editor.

I did update python code, but that would require testing. Testing is
needed for this commit in general, too many changes happened on all
levels of the animation system. :)
Will keep track of all reports this evening, hopefully it doesnt break
the pre-release schedule!

source/blender/src/editconstraint.c

@@ -85,11 +85,11 @@ ListBase *get_active_constraint_channels (Object *ob, int forcevalid)
 				if (!forcevalid)
 					return NULL;
 				
-				ob->action=add_empty_action();
+				ob->action=add_empty_action(ID_PO);
 			}
 			
 			/* Make sure we have an actionchannel */
-			achan = get_named_actionchannel(ob->action, pchan->name);
+			achan = get_action_channel(ob->action, pchan->name);
 			if (!achan){
 				if (!forcevalid)
 					return NULL;
@@ -109,7 +109,17 @@ ListBase *get_active_constraint_channels (Object *ob, int forcevalid)
 		else return NULL;
 	}
 	/* else we return object constraints */
-	return &ob->constraintChannels;
+	else {
+		if(ob->ipoflag & OB_ACTION_OB) {
+			bActionChannel *achan = get_action_channel(ob->action, "Object");
+			if(achan)
+				return &achan->constraintChannels;
+			else 
+				return NULL;
+		}
+		
+		return &ob->constraintChannels;
+	}
 }
 
 
@@ -162,7 +172,7 @@ bConstraintChannel *get_active_constraint_channel(Object *ob)
 					if(con->flag & CONSTRAINT_ACTIVE)
 						break;
 				if(con) {
-					bActionChannel *achan = get_named_actionchannel(ob->action, pchan->name);
+					bActionChannel *achan = get_action_channel(ob->action, pchan->name);
 					if(achan) {
 						for(chan= achan->constraintChannels.first; chan; chan= chan->next)
 							if(!strcmp(chan->name, con->name))
@@ -178,10 +188,14 @@ bConstraintChannel *get_active_constraint_channel(Object *ob)
 			if(con->flag & CONSTRAINT_ACTIVE)
 				break;
 		if(con) {
-			for(chan= ob->constraintChannels.first; chan; chan= chan->next)
-				if(!strcmp(chan->name, con->name))
-					break;
-			return chan;
+			ListBase *lb= get_active_constraint_channels(ob, 0);
+
+			if(lb) {
+				for(chan= lb->first; chan; chan= chan->next)
+					if(!strcmp(chan->name, con->name))
+						break;
+				return chan;
+			}
 		}
 	}
 	
@@ -189,7 +203,6 @@ bConstraintChannel *get_active_constraint_channel(Object *ob)
 }
 
 
-
 bConstraint *add_new_constraint(short type)
 {
 	bConstraint *con;