Substitute fprintf call by fputs call to conform with the new ubuntu

compilation rules

python/obitools3/apps/progress.pxd

@@ -5,6 +5,7 @@ from ..utils cimport str2bytes
 cdef extern from "stdio.h":
     struct FILE
     int fprintf(FILE *stream, char *format, ...)
+    int fputs(char *string, FILE *stream)
     FILE* stderr
     ctypedef unsigned int off_t "unsigned long long"
     

python/obitools3/apps/progress.pyx

@@ -126,7 +126,7 @@ cdef class ProgressBar:
             if twentyth != self.lastlog:
                 
                 if self.ontty:
-                    <void>fprintf(stderr,b'\n')
+                    <void>fputs(b'\n',stderr)
                     
                 self.logger.info('%s %5.1f %% remain : %02d:%02d:%02d' % (
                                         bytes2str(self.head),