_glh_recall_line
if(_glh_recall_line(gl->glh, gl->preload_id, gl->line, gl->linelen+1)) {
_glh_recall_line(gl->glh, gl->preload_id, gl->line, gl->linelen+1);
char *_glh_recall_line(GlHistory *glh, GlhLineID id, char *line, size_t dim);