fbpic/fbpic: 0.7.0

This version incorporates various new features, optimizations and bug fixes. See below for a details. New features: The messages printed by FBPIC to the terminal have been improved. The Simulation class now supports a verbose_level argument, in order to choose the desired level of information #158. More self-consistent initialization of the laser field #150. The laser initialization now supports arbitrary laser profiles and is always exactly divergence-free, even for MPI-decomposed simulations. More laser profiles will be implemented and documented in the next release. New optimizations: The code performs fewer Hankel transforms per iteration, and is thus faster #161. Faster functions for removal/addition of particles on GPU #179 Bug fixes: The position where plasma starts to be injected (for simulations with moving window, featuring no plasma initially in the box) has been corrected. This mainly affects boosted-frame simulations. #160 When restarting simulations from checkpoints, there was a bug in the particle weights, which is now fixed. #178 The current and charge density are now written in the fields diagnostics for iteration 0, whereas they were previously set to 0 in the diagnostics for this iteration. #178 The boosted-frame particle diagnostics used to fail in some cases on GPU due to an out-of-bound access, which is now fixed. #169 Changes related to the installation process: FBPIC can now use numba 0.36 with threading #167 and #170. FBPIC is now able to load MKL on Windows #177 and has better support when MKL fails to load #154. FBPIC can now run without having MPI installed (for single-GPU or single-CPU node simulations) #14