Coding day 2015 misc commands

REMOVE:

 * bin - custom histogram implementation. Replaced by numpy
 * blockfile - Replaced by h5md and pickel/shelf
 * writemd - Remove. Replaced by h5md
 * readmd (Dito)
 * replacestdchannel - Output redirecting. (stdout, stderr)
 * time_integration - Times the integrate command. Replace by python functionallity or remove

Random number generator:
Replaced by numpy

Control of core features:

 * constraint (sub hierarchy of the actor class)
 * correlation
 * observable
 * cuda
 * efield_caps
 * electrokinetics (convert to actor)
 * external_potential (convert to actor)
 * h5mdfile
 * ghmc
 * load_state (apparently ghmc related, undocumented. Maybe Sela Samins nows)
 * save_state (dito)
 * harmonic_orientation_well (Actor)
 * harmonic_well (Actor)
 * iccp3m (Electrostatics actor or electrostatics extensions acttor)
 * integrate_sd
 * lbnode (probably System class)
 * lbnode_extforce (Probably system class or maybe actor)
 * lees_edwards_offset (system class)
 * metadynamics
 * minimize_energy
 * nemd
 * on_collision (Rudolf)
 * reaction
 * sd_set_particles_apart (Unclear, Stokes dynamics)
 * sd_test (Dito)
 * sort_particles
 * system_CMS (analysis module)
 * system_CMS_velocity (analysis module)

Convenience:
 * imd - Imd for online visualization. Non-working code exists, potentially replace by mayavi connector
 * uwerr
 * readpdb

Paritlce generators/modifiers:
 * counterions
 * crosslink
 * diamond
 * galilei_transform
 * icosaeder
 * kill_particle_forces
 * kill_particle_motion
 * maxwell_velocities
 * salt
 * polymer
 * velocities