Checklist changes (base file names) in sourceprops_cubep3m.F90

Photon conservation with or without LLS in output.F90. This does
not work properly yet.
Merge branch 'master' of github.com:garrelt/C2-Ray3Dm
Added definition of parameter beta to list of parameters for the
Prochaska LLS model. In this version this is commented out. To
activate the Prochaska model, uncomment the four variables
and comment the values set by the other model (Songaila, McQuinn).
Bug in reading in the iteration dump. The file to be opened should
have been iterfile (which can take several values) but was "iterdump.bin"
(one value). This is now fixed.