PRO printv, verb, str

; Description: This module prints the string "str" to the screen only if the parameter "verb"
;              is set to "1". This module is useful for controlling the printed output from
;              any program.
;
; Input Parameters:
;
;   verb - INTEGER/LONG - If this parameter is set to "1", then the module will print the 
;                         string "str" to the screen. If this parameter is set to any other 
;                         value, then the module will do nothing.
;   str - STRING - The string to be printed to the screen if required. If this parameter is
;                  not a scalar string, then the module will do nothing.
;
; Author: Dan Bramich (dmb@ing.iac.es)
;
; History:
;
;   07/11/2008 - Module created (dmb)

;If "str" is not a scalar string, then do nothing

;If the parameter "verb" is set to "1", then print the string "str" to the screen