New issue 56 by ajo...@strw.leidenuniv.nl: Public variables in hydro.h
http://code.google.com/p/pencil-code/issues/detail?id=56
Currently there are many public variables in hydro.h, e.g.
calc_mflow, uumz, guumz, lcalc_uumean, uumxy, lcalc_uumeanxy
These variables should be shared using the SharedVariables module instead.