New action estimate_size for -find and -findx

libisoburn/trunk/xorriso/xorriso.texi

@@ -2077,6 +2077,12 @@ E.g.:
 @*
   -find / -disk_name *_secret -exec hide on
 @*
+@item estimate_size
+prints a lower and an upper estimation of the number of blocks which the
+found files together will occupy in the emering ISO image.
+This does not account for the superblock,
+for the directories in the -find path, or for image padding.
+@*
 @item find
 performs another run of -find on the matching file address.
 It accepts the same params as -find, except iso_rr_path.