renamed seek enumerator, fixed export

Renamed whence enumerator for seeks; now uses the word "seek" instead of
"whence". Fixed an export on the null I/O chunk.
better app path resolution, fixed file stat bug

Improve the application path implementation to make use of the application
name; full implementation waiting on configuration file parsing. Fixed a bug
that prevented running isfile/islink/isdir on non-existent files.