There were two places where varobjs are printed, which makes it hard to add 
new fields, or new commands that create varobjs.

This patch create new function. No regressions. It slightly changed the 
behaviour -- if we create a varobj with -var-create and it has no type, the 
old code would print

	type=""

and the new code does not print "type" field at all. That's no a problem, 
however -- if there's no type for a top-level variable, you'll have lots of 
asserts fire before even going to printing.

OK?

- Volodya

	* mi/mi-cmd-var.c (print_varobj): New function.
	(mi_cmd_var_create): Use the above.
	(mi_cmd_var_list_children): Likewise.