Added sf-scrub-build, for completely freeing up the resources used by a build (ie deleting it from the HD). Removed import of generated ant script as it had no effect, and was causing strange failures with sf-scrub-build.

@echo off
setlocal
if not defined HELIUM_HOME set HELIUM_HOME=%~dp0..\..\..\..\helium
echo %HELIUM_HOME%
rem call ..\..\build\env.bat
call %HELIUM_HOME%\hlm.bat %*
endlocal