Rename zerocash to Zcash.

qa/zerocash/full-test-suite.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 #
-# Execute all of the automated tests related to zerocash.
+# Execute all of the automated tests related to Zcash.
 #
 # This script will someday define part of our acceptance criteria for
 # pull requests.

zcutil/fetch-params.sh

@@ -42,7 +42,7 @@ EOF
     # This may be the first time the user's run this script, so give
     # them some info, especially about bandwidth usage:
     cat <<EOF
-This script will fetch the zerocash zkSNARK parameters and verify their
+This script will fetch the Zcash zkSNARK parameters and verify their
 integrity with sha256sum.
 
 The parameters currently are about 2GiB in size, so plan accordingly