Remove compression.

Messes up extraction, since we random access for the timestamp binary
search.  In the future, maybe switching to multiple tables (one for
timestamp, one for compressed data) would be smart.

nilmdb/nilmdb.py

@@ -324,20 +324,14 @@ class NilmDB(object):
         # 3 months worth of data at 8 KHz.  It's OK if this is wrong.
         exp_rows = 8000 * 60*60*24*30*3
 
-        # Use a light compression filter.  zlib is supported
-        # everywhere; blosc may be better in the future.
-        compfilt = tables.Filters(complevel = 1,
-                                  complib = 'zlib')
-
         # Create the table
         try:
             table = self.h5file.createTable(group,
                                             node,
                                             description = desc,
                                             expectedrows = exp_rows,
-                                            createparents = True,
-                                            filters = compfilt)
-        except (AttributeError, TypeError):
+                                            createparents = True)
+        except AttributeError:
             # Trying to create e.g. /foo/bar/baz when /foo/bar is already
             # a table raises this error.
             raise ValueError("error creating table at that path")