slight tweak to well-tested, segfault-free code
sign entire script input
modify DefaultScript to remove redundant data

Since a signed message includes the original message, it didn't make
sense to append the input to the signed message. The default script
now moves the data pointer to the input inside the signed message.
Merge pull request #163 from lukechampine/scripting

Sign the entire script input
cotinue working on UploadFile
organizational stuff
change MerkleCollapse to a standalone function
continue with UploadFile, only 2 steps remain
get parent hash for resized sector in Upload
finish UploadFile