update tau_ew parameter.
slight modification to adjust_uv_filesize.

do not overwrite adjusted files. If files exists, skip.
add in to header of batch script

group name : paper (-l paper)
batch apply cal now takes dirs of uvfiles not only uvfiles.
a few changes to batch scripts.

pullants : change ants
redcal   : per dir basis
xtalk    : xtalk remove only if file size is 1.1G (1Hr)
updates to plot_red_cal, red_calv003