Added p_norm minimum value for anisotropic scattering
created p_escape_from_tau subroutine
Few more comments
Included fix in later section in trans_phot.c
Comment modified
Merge pull request #98 from jhmatthews/inf_aniso_hotfix

Fix for infinite entries in spec files - default p_escape to 1.0 for low and high tau
Modified xdefine_phot so only calculate level emissivities if geo.pcycle is 0
Merge pull request #99 from jhmatthews/dev

Reporting issues from mean_intensity
Changed version to 78a
corrected a load of set but unused variables which threw compiler warnings
Changes to Makefile to use -fno-aggressive-loop-optimizations for gcc>4.8, see #100
Fixed missing factors in PI_rate.c
Added pi_rates.c
Put check around windsave command in python, so only rank0 writes
Added a Debug feature to log.c and a new parameter switch -d to python to replace the use of printf for debugging
Fixed issue 106 which had to do
with the fact that we want at least a minimimil model to be
calculated if the user simply hist carriage return for every
interactive command.  Now you will run one ionization and one
spectral cycle for a simple SV model.

In the process, elimianted the variable wcycle, pcycle, wcycles
and pcycles in favor of the analagous variable sin the goe
structure.
Small changes to elimiante warnings when
compiled with clash
Small change to .travis.yml to reflect examples change
Changes to allow for microclumping ot the wind #108
Small changes in preparation for the public
relaase.  In particularly, effectively commenented out the Compton torus
and changed input for photons_per_cycle to a double, so that numbers like
1e6 could be input.