Include header files within the source tree using "" instead of <>

The <> syntax is intended for system header files, see
https://gcc.gnu.org/onlinedocs/cpp/Include-Syntax.html
I think <> might make sense to use when including external libraries
but files that are under src/ of this repo really don't fall under
that category IMO.

The reason I care is that although Bazel can be made to work with this
with some hacking, the normal way of specifying include paths does not
allow the <> syntax if the file is in the same WORKSPACE.

src/init.cpp

@@ -53,7 +53,7 @@
 #include <boost/thread.hpp>
 #include <openssl/crypto.h>
 
-#include <libsnark/common/profiling.hpp>
+#include "libsnark/common/profiling.hpp"
 
 #if ENABLE_ZMQ
 #include "zmq/zmqnotificationinterface.h"

src/leveldbwrapper.cpp

@@ -8,10 +8,10 @@
 
 #include <boost/filesystem.hpp>
 
-#include <leveldb/cache.h>
-#include <leveldb/env.h>
-#include <leveldb/filter_policy.h>
-#include <memenv.h>
+#include "leveldb/cache.h"
+#include "leveldb/env.h"
+#include "leveldb/filter_policy.h"
+#include "memenv.h"
 
 void HandleError(const leveldb::Status& status)
 {

src/leveldbwrapper.h

@@ -13,8 +13,8 @@
 
 #include <boost/filesystem/path.hpp>
 
-#include <leveldb/db.h>
-#include <leveldb/write_batch.h>
+#include "leveldb/db.h"
+#include "leveldb/write_batch.h"
 
 class leveldb_error : public std::runtime_error
 {

src/pubkey.cpp

@@ -5,8 +5,8 @@
 
 #include "pubkey.h"
 
-#include <secp256k1.h>
-#include <secp256k1_recovery.h>
+#include "secp256k1.h"
+#include "secp256k1_recovery.h"
 
 namespace
 {

src/zcash/JoinSplit.cpp

@@ -10,10 +10,10 @@
 #include <boost/format.hpp>
 #include <boost/optional.hpp>
 #include <fstream>
-#include <libsnark/common/default_types/r1cs_ppzksnark_pp.hpp>
-#include <libsnark/zk_proof_systems/ppzksnark/r1cs_ppzksnark/r1cs_ppzksnark.hpp>
-#include <libsnark/gadgetlib1/gadgets/hashes/sha256/sha256_gadget.hpp>
-#include <libsnark/gadgetlib1/gadgets/merkle_tree/merkle_tree_check_read_gadget.hpp>
+#include "libsnark/common/default_types/r1cs_ppzksnark_pp.hpp"
+#include "libsnark/zk_proof_systems/ppzksnark/r1cs_ppzksnark/r1cs_ppzksnark.hpp"
+#include "libsnark/gadgetlib1/gadgets/hashes/sha256/sha256_gadget.hpp"
+#include "libsnark/gadgetlib1/gadgets/merkle_tree/merkle_tree_check_read_gadget.hpp"
 #include "tinyformat.h"
 #include "sync.h"
 #include "amount.h"

src/zcash/Proof.cpp

@@ -3,8 +3,8 @@
 #include "crypto/common.h"
 
 #include <boost/static_assert.hpp>
-#include <libsnark/common/default_types/r1cs_ppzksnark_pp.hpp>
-#include <libsnark/zk_proof_systems/ppzksnark/r1cs_ppzksnark/r1cs_ppzksnark.hpp>
+#include "libsnark/common/default_types/r1cs_ppzksnark_pp.hpp"
+#include "libsnark/zk_proof_systems/ppzksnark/r1cs_ppzksnark/r1cs_ppzksnark.hpp"
 #include <mutex>
 
 using namespace libsnark;