Add fault tolerance features to djpeg and jpegtran

- Enable progress reporting at run time using a new -report argument
  (cjpeg now supports that argument as well)
- Limit the allowable number of scans using a new -maxscans argument
- Treat warnings as fatal using a new -strict argument

This mainly demonstrates how to work around the two issues with the
JPEG standard described here:
https://libjpeg-turbo.org/pmwiki/uploads/About/TwoIssueswiththeJPEGStandard.pdf
since those and similar issues continue to be erroneously reported as
libjpeg-turbo bugs.

cjpeg.c

@@ -5,7 +5,7 @@
  * Copyright (C) 1991-1998, Thomas G. Lane.
  * Modified 2003-2011 by Guido Vollbeding.
  * libjpeg-turbo Modifications:
- * Copyright (C) 2010, 2013-2014, 2017, D. R. Commander.
+ * Copyright (C) 2010, 2013-2014, 2017, 2019, D. R. Commander.
  * For conditions of distribution and use, see the accompanying README.ijg
  * file.
  *
@@ -147,6 +147,7 @@ static const char *progname;    /* program name for error messages */
 static char *icc_filename;      /* for -icc switch */
 static char *outfilename;       /* for -outfile switch */
 boolean memdst;                 /* for -memdst switch */
+boolean report;                 /* for -report switch */
 
 
 LOCAL(void)
@@ -200,6 +201,7 @@ usage(void)
 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
   fprintf(stderr, "  -memdst        Compress to memory instead of file (useful for benchmarking)\n");
 #endif
+  fprintf(stderr, "  -report        Report compression progress\n");
   fprintf(stderr, "  -verbose  or  -debug   Emit debug output\n");
   fprintf(stderr, "  -version       Print version information and exit\n");
   fprintf(stderr, "Switches for wizards:\n");
@@ -244,6 +246,7 @@ parse_switches(j_compress_ptr cinfo, int argc, char **argv,
   icc_filename = NULL;
   outfilename = NULL;
   memdst = FALSE;
+  report = FALSE;
   cinfo->err->trace_level = 0;
 
   /* Scan command line options, adjust parameters */
@@ -395,6 +398,9 @@ parse_switches(j_compress_ptr cinfo, int argc, char **argv,
       qtablefile = argv[argn];
       /* We postpone actually reading the file in case -quality comes later. */
 
+    } else if (keymatch(arg, "report", 3)) {
+      report = TRUE;
+
     } else if (keymatch(arg, "restart", 1)) {
       /* Restart interval in MCU rows (or in MCUs with 'b'). */
       long lval;
@@ -505,9 +511,7 @@ main(int argc, char **argv)
 {
   struct jpeg_compress_struct cinfo;
   struct jpeg_error_mgr jerr;
-#ifdef PROGRESS_REPORT
   struct cdjpeg_progress_mgr progress;
-#endif
   int file_index;
   cjpeg_source_ptr src_mgr;
   FILE *input_file;
@@ -628,9 +632,10 @@ main(int argc, char **argv)
     fclose(icc_file);
   }
 
-#ifdef PROGRESS_REPORT
-  start_progress_monitor((j_common_ptr)&cinfo, &progress);
-#endif
+  if (report) {
+    start_progress_monitor((j_common_ptr)&cinfo, &progress);
+    progress.report = report;
+  }
 
   /* Figure out the input file format, and set up to read it. */
   src_mgr = select_file_type(&cinfo, input_file);
@@ -676,9 +681,8 @@ main(int argc, char **argv)
   if (output_file != stdout && output_file != NULL)
     fclose(output_file);
 
-#ifdef PROGRESS_REPORT
-  end_progress_monitor((j_common_ptr)&cinfo);
-#endif
+  if (report)
+    end_progress_monitor((j_common_ptr)&cinfo);
 
   if (memdst) {
     fprintf(stderr, "Compressed size:  %lu bytes\n", outsize);