Allow linearization scripts to support hash byte reversal

Currently, the linearization scripts require input hashes to be in one endian form. Add support for byte reversal.

contrib/linearize/example-linearize.cfg

@@ -23,7 +23,9 @@ input=/home/example/.bitcoin/blocks
 
 output_file=/home/example/Downloads/bootstrap.dat
 hashlist=hashlist.txt
-split_year=1
 
 # Maxmimum size in bytes of out-of-order blocks cache in memory
 out_of_order_cache_sz = 100000000
+
+# Do we want the reverse the hash bytes coming from getblockhash?
+rev_hash_bytes = False