add Getwd, Fchdir, tests

R=r
DELTA=215  (186 added, 0 deleted, 29 changed)
OCL=28968
CL=28995
8 files changed
tree: eb92c3b09fb143cf90ddfe36300008082006c8e0
  1. doc/
  2. include/
  3. lib/
  4. pkg/
  5. src/
  6. test/
  7. usr/