anchor.diff:  echo Usage: build.cmd [command]
   echo     Updates the working copy, cleans and builds the vm using nmake,
   echo     fetches a boot image, and bootstraps factor.
  -echo
  +echo:
   echo     The branch that bootstraps is the one that is checked out locally.
  -echo
  +echo:
   echo     compile - recompile vm
   echo     update - git pull, recompile vm, download a boot image, bootstrap
   echo     self-bootstrap - git pull, make a boot image, bootstrap
  
positive.code: ) else if "%1"=="" (
      set _git_pull=1
      set _compile_vm=1
      set _bootimage="download"
      set _bootstrap_factor=1
  ) else if "%1"=="latest" (
      set _git_pull=1
      set _compile_vm=1
      set _bootimage="download"
      set _bootstrap_factor=1
  ) else if "%1"=="update" (
      set _git_pull=1
      set _compile_vm=1
      set _bootimage="download"
      set _bootstrap_factor=1
  ) else if "%1"=="compile" (
      set _git_pull=0
      set _compile_vm=1
      set _bootimage="current"
      set _bootstrap_factor=0
  ) else if "%1"=="self-bootstrap" (
      set _git_pull=1
  
negative.code: ) else if "%1"=="bootstrap" (
      set _git_pull=0
      set _compile_vm=0
      set _bootimage=current
      set _bootstrap_factor=1
  ) else if "%1"=="net-bootstrap" (
      set _git_pull=0
      set _compile_vm=1
      set _bootimage=download
      set _bootstrap_factor=1
  ) else goto usage
  
  