SIGNEXTEND opcode.
Add VMTRACE to user defined vm test
VMTRACE for internal calls
Interpret the second argument as byte number, not bit number.
use ETHEREUM_TEST_PATH in all tests
bugfix
Merge pull request #1 from chriseth/signextend

Implementation of SIGNEXTEND opcode
Merge remote-tracking branch 'origin/newTests' into newTests
Merge remote-tracking branch 'upstream/develop' into newTests

Conflicts:
	libevm/VM.h
	libevmface/Instruction.h
	test/vm.cpp
Merge remote-tracking branch 'upstream/develop' into newTests

Conflicts:
	test/vm.cpp
	test/vm.h
Added tests for SIGNEXTEND and BNOT
Fixed storage output in VMTRACE for vm tests
merge
Reverse operators for SIGNEXTEND and bugfix for k > 2**64.
PoC-7: Latest SIGNEXTEND.
Merge branch 'develop' of github.com:ethereum/cpp-ethereum into develop
fix for compiling under llvm
Fix VM test code loading conditions
Merge pull request #436 from debris/develop

fix for compiling under llvm
Merge pull request #438 from imapp-pl/pr-fixes

Fix VM test code loading conditions