PDFGen13 - further work on PDF certificate

1. Reduced font size for data info.
2. Used a define for text point size to make it easier
to change size.
3. Started work on function to parse sense data for older
versions of hdparm (9.60) that fail to parse the real max
sectors correctly. (fixed in 9.65).
4. Miscellaneous changes.

More changes to follow ..

src/context.h

@@ -163,6 +163,9 @@ typedef struct nwipe_context_t_
     u64 HPA_reported_real;  // the 'HPA real' value reported hdparm -N, i.e the second value of n/n
     int DCO_status;  // 0 = No DCO found, 1 = DCO detected, 2 = Unknown, unable to checked
     u64 DCO_reported_real_max_sectors;  // real max sectors as reported by hdparm --dco-identify
+    u64 DCO_reported_real_max_size;  // real max sectors in bytes
+    char DCO_reported_real_max_size_text[NWIPE_DEVICE_SIZE_TXT_LENGTH];  // real max size in human readable form i.e 1TB
+                                                                         // etc
     u64 HPA_size;  // The size of the host protected area in sectors
     char HPA_size_text[NWIPE_DEVICE_SIZE_TXT_LENGTH];  // Human readable size bytes, KB, MB, GB ..
     int HPA_display_toggle_state;  // 0 or 1 Used to toggle between "[1TB] [ 33C]" and [HDA STATUS]