transform plugin incorrectly modifies TZR parameters

[Michael Keith]

The units.C code has

    xform_mjd(&psr->param[param_tzrmjd],0, f); // XXX barycentric (TB) MJD?
    scale_param(&psr->param[param_tzrfrq],0, one/f); // XXX Barycentric freq??

But I’m pretty sure that TZRMJD and TZRFREQ is in the frame of the TZRSITE and hence not barycentric.
Possibly this does need to be modified if TZRSITE is the barycentre, but for most cases this should not be modified.

[Michael Keith]

Fixed as of 35c76f6 ( Don't modify TZR parameters in transform)