Update script.h
Update script.h

* Fix MSVC C4245: signed/unsigned mismatch
* Commented out SEQUENCE_THRESHOLD: never used
* C++ style comments
penek/novacoin,novacoin-project/novacoin,byncoin-project/byncoin,novacoin-project/novacoin,penek/novacoin,penek/novacoin,novacoin-project/novacoin,byncoin-project/byncoin,penek/novacoin,byncoin-project/byncoin,novacoin-project/novacoin,novacoin-project/novacoin,novacoin-project/novacoin,penek/novacoin,byncoin-project/byncoin,byncoin-project/byncoin,penek/novacoin,byncoin-project/byncoin