Close the file after writing events. Not adding context manager as th…

…e class is used only here.

pycbc/events/eventmgr.py

@@ -417,7 +417,7 @@ def write_events(self, outname):
     def write_to_hdf(self, outname):
         class fw(object):
             def __init__(self, name, prefix):
-                self.f = h5py.File(name, 'w')
+                self.f_name = name
                 self.prefix = prefix
 
             def __setitem__(self, name, data):
@@ -551,6 +551,8 @@ def __setitem__(self, name, data):
                     f['gating/' + gate_type + '/pad'] = \
                             numpy.array([g[2] for g in gating_info[gate_type]])
 
+        f.f.close()
+
 
 class EventManagerMultiDetBase(EventManager):
     def __init__(self, opt, ifos, column, column_types, psd=None, **kwargs):