Remove neo Block support, allow filtering with lsx files

Don't use neo Block, only use neo Segment.
Allow providing list of lsx files referencing mpx files to load. If not
provided, load all mpx files available in dirname

Author: thperret

neo/io/alphaomegaio.py

@@ -5,6 +5,13 @@
 class AlphaOmegaIO(AlphaOmegaRawIO, BaseFromRaw):
     """Class for reading data from AlphaOmega MPX file"""
 
-    def __init__(self, filename):
-        AlphaOmegaRawIO.__init__(self, dirname=filename)
+    __doc__ = AlphaOmegaRawIO.__doc__
+
+    def __init__(self, filename, lsx_files=None, prune_channels=True):
+        AlphaOmegaRawIO.__init__(
+            self,
+            dirname=filename,
+            lsx_files=lsx_files,
+            prune_channels=prune_channels,
+        )
         BaseFromRaw.__init__(self, filename)