Add support for Warp starfiles.

[mgflast]

Hi,

Re: #38

I edited RELIONParticleData.py to

1. add a workaround for the rlnTomoName bug
2. add support for Warp starfiles, by detecting whether there is a column wrpCoordinateZ1 and if so changing the relevant wrp* column headers to rln*, in RELIONParticleData.read_file

I tested the changes and they work fine for me.