implemented incremental HDF5 writing (Fixes #33)

src/damaris/gui/DamarisGUI.py

@@ -874,15 +874,6 @@ class DamarisGUI:
                                                    filters=tables.Filters( complevel=9, complib='zlib' ) )
 
         if dump_file is None and os.path.isfile( self.dump_filename ) and tables.is_pytables_file( self.dump_filename ):
-            # take some data from dump file and repack
-            os.rename( self.dump_filename, self.dump_filename + ".bak" )
-            old_dump_file = tables.open_file( self.dump_filename + ".bak", mode="r+" )
-            if "data_pool" in old_dump_file.root:
-                old_dump_file.remove_node( where="/", name="data_pool", recursive=True )
-            old_dump_file.copy_file( self.dump_filename )
-            old_dump_file.close( )
-            del old_dump_file
-            os.remove( self.dump_filename + ".bak" )
             # prepare for update
             dump_file = tables.open_file( self.dump_filename, mode="r+" )
 
@@ -899,7 +890,8 @@ class DamarisGUI:
 
         # save the data!
         self.data.write_hdf5( dump_file, where="/", name="data_pool",
-                              complib=self.dump_complib, complevel=self.dump_complevel )
+                              complib=self.dump_complib, complevel=self.dump_complevel,
+                              incremental=not init )
 
         # now save additional information
         e = self.si.data.get( "__recentexperiment", -1 ) + 1