make LIST generic
rename particle.[ch] to list.[ch]
update Makefile for renamed files
Merge branch 'ParticleChase_TestBox' into ParticleChase
clean up notation
remove velocity from particle

it's saved in the velocity field
create example files for particles and world parameter
typo
the worlds length plays a role
more precise comment
keep consistent programming style
particles and parameter are set by input files
handle command line arguments
file handling for input files
update WORLD function names
init has to handle parameter and particle data files
read parameter and particles into the world
remove variable settings which are read in
set debugging compile flags
change order of argument list -> particles before parameter