Updated generator to support particle redirect

It now generates also an array of momentum stride bounds.

Basic variant of notail generation

Added read/write for strided notail method

Passing moment length array works.

Changed M length array to M position array
Added redirecting algorithm to model

Very basic version of redirect

Just marking particles for redirect works.

Finished redirecting algorithm

Redirecting algorithm works with field
Added additional spare particle generation
Added modelling time display in film
Merge branch 't_in_film'

Also added M position files to gitignore.