Load File::Copy on demand.

Its only used in one place.
Load Fcntl on demand.
Load File::Temp on demand.

About 20% has been shaved off so far in this branch.
Load Cwd on demand.

Doesn't have an impact because of File::Spec.  Getting to that.
Load File::stat on demand.

About 5% of load time.
Load File::Path on demand.
fix up prereq detection
updated README and META