core_tests: add tests for hard fork behaviors (MRL-0004)

We also replace the --fakechain option with an optional structure
containing details about configuration for the core/blockchain,
for test purposes. This seems more future friendly.

tests/core_tests/CMakeLists.txt

@@ -38,7 +38,8 @@ set(core_tests_sources
   integer_overflow.cpp
   ring_signature_1.cpp
   transaction_tests.cpp
-  tx_validation.cpp)
+  tx_validation.cpp
+  v2_tests.cpp)
 
 set(core_tests_headers
   block_reward.h
@@ -52,7 +53,8 @@ set(core_tests_headers
   integer_overflow.h
   ring_signature_1.h
   transaction_tests.h
-  tx_validation.h)
+  tx_validation.h
+  v2_tests.h)
 
 add_executable(coretests
   ${core_tests_sources}