bandwidth.m: Add new function. * NEWS: Announce new function. * scripts/linear-algebra/module.mk: New function added to the build system. * scripts/help/__unimplemented__.m: New function removed from unimplemented. * scripts/linear-algebra/isbanded.m: New function added as documentation reference. * scripts/linear-algebra/isdiag.m: New function added as documentation reference. * scripts/linear-algebra/istril.m: New function added as documentation reference. * scripts/linear-algebra/istriu.m: New function added as documentation reference. * scripts/linear-algebra/bandwidth.m: New function. * linalg.txi: Add bandwidth function to manual.

--- a/scripts/linear-algebra/istril.m	Tue Jul 08 20:45:50 2014 +0100
+++ b/scripts/linear-algebra/istril.m	Tue Jul 08 12:19:37 2014 +0200
@@ -22,7 +22,7 @@
 ##
 ## A lower triangular matrix has nonzero entries only on the main diagonal
 ## and below.
-## @seealso{istriu, isbanded, isdiag, tril}
+## @seealso{istriu, isbanded, isdiag, tril, bandwidth}
 ## @end deftypefn
 
 ## Author: Massimiliano Fasi