PICSARlite: Compilation

The command to invoke the script with the particular settings we use to generate PICSARlite is:

python utils/ --geom 3d --solver fdtd --pusher boris
--depos direct --charge off --order 2 --laser off --optimization off
--diags off --errchk off

These options are for: 3D geometry, finite-difference time-domain solver, Boris particle pusher, direct current deposition, no charge deposition, second-order current deposition, no laser injection, no optimization, no diagnostics, and no flagging of warning messages when code is trying to use unavailable routines.