Add the ability to test scaling when decompressing to YUV; compression from YUV to JPEG; and YUV padding.  Replace clunky -411 and -440 parameters with a -subsamp parameter that allows any of the subsampling options to be tested in isolation.


git-svn-id: svn://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1075 632fc199-4ca6-4c93-a231-07263d6284db