mdb_v8 could keep more characters for each function name

[davepacheco]

It's not uncommon for the full paths for some require'd files to be a few hundred characters long. Unfortunately, jsfunctions only keeps a limited number of characters. Not only does this break output (because you can't see the actual file name), but since searching is based on these paths, you can't search by these script names either. This makes it nearly impossible to find functions defined in those files.