CWallet: fix nTimeFirstKey init, by making constructor init common code

Don't repeat yourself etc.

Conflicts:
	src/wallet.h
Remove template matching params from GetOpName()

Since they are not real opcodes, being reported as OP_UNKNOWN is less confusing for human-readable decoding.

Signed-off-by: Huang Le <4tarhl@gmail.com>

Conflicts:
	src/script.cpp
linux: dynamically link to librt and libdl
linux: enable dbus by default
bump version