Set initial position in grtde and grstar

[Shigaharuki3012]

It seems that we can not set the initial position of the star in grtde or grstar setup.That is , star will be initially setted at the apocenter.
Can we just call set_binary in the moddump_tidal.f90? Or just add "binary" setup and moddump file in the Makefile_setup? (Just like when we use SETUP=star,where "binary" setup and moddump used)

[danieljprice]

it would be possible to do this by adding an extra parameter to the setup specifying the true anomaly, since the star is setup using set_binary, it is straightforward to send the full orbital elements to this routine

I also started work on a new general set_orbit module which could be used here