Method descr

This method prints a description of the preconditioner p to the standard output or to a file. It must be called after hierachy_build and smoothers_build, or build, have been called.

`info`	`integer, intent(out)`.
	Error code. If no error, 0 is returned. See Section 7 for details.
`iout`	`integer, intent(in), optional`.
	The id of the file where the preconditioner description will be printed; the default is the standard output.
`root`	`integer, intent(in), optional`.
	The id of the process where the preconditioner description will be printed; the default is `psb_root_`.
`verbosity`	`integer, intent(in), optional`.
	The verbosity level of the description. Default value is 0. For values higher than 0, it prints out further information, e.g., for a distributed multilevel preconditioner the size of the coarse matrices on every process.

5.8 Method descr