Allow x0 to be an input to the python interface of libgene_tango #9
Description
The current version of libgene_tano.F90 has x0 = 0.5 (on two separate lines). This overrides what is in the GENE parameters file. If a value other than x0=0.5 is desired, currently one would have to manually change this value and recompile libgene_tango.