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Make -v print only info-level messages by default.

Previously -v set the verbosity level to 9. Anything 3 or greater
prints all debug messages, which can be quite overwhelming when
individual decode elements are traced. Now the default with -v is 2.

Run jbig2dec --verbose=3 to recover the old behaviour.

--- a/jbig2dec.1

+++ b/jbig2dec.1

@@ -53,6 +53,9 @@

 .TP

 .BR -v " or " --verbose

 Report additional information about the decoding process.

+Pass just \fB-v\fR for information about the file as it's being decoded.

+This is the same as \fB--verbose=2\fR.

+Pass \fB--verbose=3\fR or higher for debugging information.

 .TP

 .BR --version

 Show program version information.

--- a/jbig2dec.c

+++ b/jbig2dec.c

@@ -155,7 +155,7 @@

 				break;

                         case 'v':

                                 if (optarg) params->verbose = atoi(optarg);

-                                else params->verbose = 9;

+                                else params->verbose = 2;

                                 break;

 			case 'h':

 			case '?':