Sindbad~EG File Manager

void position(int, int *);  /* public, called in grapher.c */
void set_title_viewport(int position);  /* not static, called in grapher.c */
void setupdata(int *, int *, term, graph **);
int  default_range(term, int, int, double *, double *, double *, double *, graph *);
void adjust_graph_structures(int, term, graph**);
int nonconstant_exponent(term);
int fix_exponents(term,term *);
int needs_circular_aspect(int,int);
void pixel_fields(graph *);
void fill_graph_structures(int ngraphs, int mainchoice, term t, graph **graphs);
void calculate_singularities(int ngraphs, int mainchoice, term t, graph**graphs);
term domain_filter(term t, term x, term u);
void set_graph_range(graph *g, term ineq);