testsuite: introduce index in varobj child eval.

testsuite: introduce index in varobj child eval.

In some languages, e.g. fortran, arrays start with index 1
instead 0. This patch changes the MI library to support testing
varobj children of fortran arrays.

2013-11-21  Keven Boell  <keven.boell@intel.com>

testsuite/

	* lib/mi-support.exp (mi_list_varobj_children_range): Add
	call to mi_list_array_varobj_children_with_index.
	(mi_list_array_varobj_children_with_index): New function.
	Add parameter to specify array start.