[patch, fortran, testsuite] Rename tests with inappropriate number format

[Brooks Moses]

There are a number of tests in the gfortran.dg testsuite that have the 
numbers "wrong" in some way -- either having "-1" instead of "_1", or 
having a test_4.f and test_4.f90 that are unrelated, or having the "_1" 
left off the first test in a series.

The following patch fixes all the ones that I see.  I haven't attached 
the diff, since it's just file renames, but the ChangeLog is sufficient 
to explain everything.

-----------------------------------------------------------------
2006-12-17  Brooks Moses  <brooks.moses@codesourcery.com>

	* gfortran.dg/advance.f90: Renamed to...
	* gfortran.dg/advance_1.f90: ...new filename.
	* gfortran.dg/append-1.f90: Renamed to...
	* gfortran.dg/append_1.f90: ...new filename.
	* gfortran.dg/array-1.f90: Renamed to...
	* gfortran.dg/array_1.f90: ...new filename.
	* gfortran.dg/assign_4.f90: Renamed to...
	* gfortran.dg/assign_8.f90: ...new filename.
	* gfortran.dg/backspace.f: Renamed to...
	* gfortran.dg/backspace_1.f: ...new filename.
	* gfortran.dg/backspace.f90: Renamed to...
	* gfortran.dg/backspace_7.f90: ...new filename.
	* gfortran.dg/default_initialization.f: Renamed to...
	* gfortran.dg/default_initialization_1.f: ...new filename.
	* gfortran.dg/dollar_edit_descriptor-1.f: Renamed to...
	* gfortran.dg/dollar_edit_descriptor_1.f: ...new filename.
	* gfortran.dg/dollar_edit_descriptor-2.f: Renamed to...
	* gfortran.dg/dollar_edit_descriptor_2.f: ...new filename.
	* gfortran.dg/dollar_edit_descriptor-3.f: Renamed to...
	* gfortran.dg/dollar_edit_descriptor_3.f: ...new filename.
	* gfortran.dg/logint-1.f: Renamed to...
	* gfortran.dg/logint_1.f: ...new filename.
	* gfortran.dg/logint-2.f: Renamed to...
	* gfortran.dg/logint_2.f: ...new filename.
	* gfortran.dg/logint-3.f: Renamed to...
	* gfortran.dg/logint_3.f: ...new filename.

-----------------------------------------------------------------

Tested on i686-pc-linuc-gnu.  Ok for trunk?

- Brooks