Some more addition for S11
Take 2 at unslushing S11

Highlights:
 - unit statement no longer exists, pod is now used to specify meta-information
 - eradicated the use of "namespace", use "package" instead
 - introduction of repository, with @*INC containing CompUnitRepo objects
 - completely removed dir/file dependency, except for CompUnitRepo::Local::File
 - -I now unshifts CompUnitRepo::Local::File object in @*INC