Empty implmentations of flock, mprotect and msync
split up FS.init
infer relative paths in file packager only when not told explicit src and dest paths, and fix test_preload_file
Updated rename tests
enable permissions checks after initialization
 - convert to new stream API function names
 - convert all indexing into FS.streams to use FS.getStream
Split out createPreloadedFile to FSCOM
initial VFS work
hacked createLazyFile to work with the new FS code