remove prints
added index helper and test
added reference frame objects for helio and galacto
frames have units
use new frame system
transform graph should be a defaultdict
updated particle and tests to use new frame
updated lm10 io
forgot minus sign in LM10 x
minor test changes
update SgrSimulation class
remove old class
docstrings
update orphan reader
fix imports and default meta cols
add test for out of order parameters
move parse quantity
added model parameter method
use new frame class
have to import modelparam