TODO list for inhomog

* Debianisation - a debian directory for preparing debian packets
   should be made available as a debian downstream version 0.1.5-1 at
   https://anonscm.debian.org/cgit/debian-astro/packages/inhomog.git

* Add some mechanism for checking that required values in the
   structures background_cosm_params and rza_integrand_params
   have been initialised and are valid.

* Documentation: doxygenisation. Rough initial draft done, as of v0.1.1.

* Throwing errors - which suspicious choices should be considered
   warnings vs fatal errors? which should be thrown up through
   the hierarchy of routines using e.g. the <errno.h> library?
