bitcoin-cli: remove unneeded dependencies (only code movement)

Remove unnecessary dependencies for bitcoin-cli
(leveldb, berkelydb, wallet, RPC server)

Build system changes:
- split libbitcoin.a into libbitcoin_common.a, libbitcoin_server.a and
  libbitcoin_cli.a

Code changes (movement only):
- split up HelpMessage into HelpMessage in init.cpp and HelpMessageCli
  in rpcclient.cpp
- move uiInterface from init.cpp to util.cpp

src/test/Makefile.am

@@ -20,7 +20,7 @@ BUILT_SOURCES = $(JSON_TEST_FILES:.json=.json.h) $(RAW_TEST_FILES:.raw=.raw.h)
 
 # test_bitcoin binary #
 test_bitcoin_CPPFLAGS = $(AM_CPPFLAGS) $(TESTDEFS)
-test_bitcoin_LDADD = $(LIBBITCOIN) $(LIBLEVELDB) $(LIBMEMENV) \
+test_bitcoin_LDADD = $(LIBBITCOIN_SERVER) $(LIBBITCOIN_CLI) $(LIBBITCOIN_COMMON) $(LIBLEVELDB) $(LIBMEMENV) \
   $(BOOST_LIBS) $(BOOST_UNIT_TEST_FRAMEWORK_LIB) $(BDB_LIBS)
 test_bitcoin_SOURCES = accounting_tests.cpp alert_tests.cpp \
   allocator_tests.cpp base32_tests.cpp base58_tests.cpp base64_tests.cpp \

src/test/test_bitcoin.cpp

@@ -14,7 +14,6 @@
 
 
 CWallet* pwalletMain;
-CClientUIInterface uiInterface;
 
 extern bool fPrintToConsole;
 extern void noui_connect();