ParticleSet: Add xfailing test for multi-execute with particle removal
ParticleSet: Add xfailing test for multi-execute with particle removal

This breaks in JIT mode because numpy.delete creates a new array and thus
invalidates our previous memory views for the JITParticle objects. To fix
this we should really use a smarter data structure as a container for
JITParticles.

OceanPARCELS/parcels,OceanPARCELS/parcels