Added signal catching and handling in C and Cython

python/obitools3/commands/tail.pyx

@@ -11,6 +11,7 @@ from obitools3.utils cimport str2bytes
 
 import time
 import sys
+from cpython.exc cimport PyErr_CheckSignals
 
 
 __title__="Keep the N last lines of a view."
@@ -70,6 +71,7 @@ def run(config):
     selection = Line_selection(i_view)
     
     for i in range(start, len(i_view)):
+        PyErr_CheckSignals()
         pb(i)
         selection.append(i)