Merge branch 'sr/gfi-options'

* sr/gfi-options:
  fast-import: add (non-)relative-marks feature
  fast-import: allow for multiple --import-marks= arguments
  fast-import: test the new option command
  fast-import: add option command
  fast-import: add feature command
  fast-import: put marks reading in its own function
  fast-import: put option parsing code in separate functions

diff --cc Documentation/git-fast-import.txt
Simple merge

diff --cc fast-import.c
Simple merge