boost: moveonly: create eccryptoverify.h|cpp and move helper functions there

Eventually (after 0.10) these files will hold the logic for crypto
verification routines, and CKey/CPubKey will call into them.

src/Makefile.am

@@ -86,6 +86,7 @@ BITCOIN_CORE_H = \
   core_io.h \
   crypter.h \
   db.h \
+  eccryptoverify.h \
   ecwrapper.h \
   hash.h \
   init.h \
@@ -220,6 +221,7 @@ libbitcoin_common_a_SOURCES = \
   core/transaction.cpp \
   core_read.cpp \
   core_write.cpp \
+  eccryptoverify.cpp \
   ecwrapper.cpp \
   hash.cpp \
   key.cpp \