Completed all flush statements. Now on Thijs machine, it looks like it does not crash anymore under normal circumstances

src/lasp/lasp_record.py

@@ -85,6 +85,7 @@ class Recording:
         try:
             # Open the file
             self.f = h5py.File(self.fn, "w", 'stdio')
+            self.f.flush()
         except Exception as e:
             logging.error(f'Error creating measurement file {e}')
             raise
@@ -151,6 +152,7 @@ class Recording:
             # Measured physical quantity metadata
             # This was how it was in LASP version < 1.0
             # f.attrs['qtys'] = [ch.qty.to_json() for ch in in_ch]
+            f.flush()
 
     def firstFrames(self, adata):
         """
@@ -227,10 +229,12 @@ class Recording:
             # instantaneously. For which we have to implement extra mutex
             # guards in this class
             del self.indh
+            self.indh = None
             
             # Remove handle to dataset otherwise the h5 file is not closed
             # properly.
             del self.ad
+            self.ad = None
 
             try:
                 # Close the recording file