Add support for non-electron bunches #109
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As the title suggests, this PR adds formal support for particle bunches of different species (e.g., positrons, protons, etc.). Until now, it was always assumed that the particles were electrons.
In order to implement this new feature, the
ParticleBunchclass now takes as an input the marcoparticle weightwinstead of the total macroparticle chargeq, and exposes two new parametersq_speciesandm_speciesthat allow the user to specify the type of particles in the bunch. By default, an electron bunch is assumed, i.e.,q_species=-eandm_species=m_e.This new feature also requires the latest aptools version (0.2.0).