pulsar_parameter_estimation_nested:
 - the code can now read in gzipped as well as ascii text input
   heterodyned data files. (This uses the XLALFileLoad to read
   in the file and XLALCreateTokenList to parse the read in string).
 - the code now has the option to only output nested samples
   for non-fixed (i.e. variable) parameters.
 - the code now has the option to gzip the resulting nested sample
   file.
pulsarpputils.py: conversion between the physical and waveform parameters is now consistent with that in ppe_models. This assumes the initial phase is the rotational phase.
LALInference.c: make output format for floats consistent between LALInferencePrintSample and LALInferencePrintSampleNonFixed

closes #1446