print more source code in the IPython debugger

This hardly deserves its own post, but I was doing some IPython debugging and wanted to see a little bit more source code than the few lines of context that it showed me by default. It turns out you can type "list" at the debugger prompt to see more.

	In [7]: %debug
	> /Users/tsrice/anaconda2/lib/python2.7/site-packages/astropy/io/fits/connect.py(224)write_table_fits()
	222 os.remove(output)
	223 else:
	--> 224 raise IOError("File exists: {0}".format(output))
	225
	226 # Create a new HDU object
	ipdb> list
	219 # Check if output file already exists
	220 if isinstance(output, string_types) and os.path.exists(output):
	221 if overwrite:
	222 os.remove(output)
	223 else:
	--> 224 raise IOError("File exists: {0}".format(output))
	225
	226 # Create a new HDU object
	227 if input.masked:
	228 #float column's default mask value needs to be Nan
	229 for column in six.itervalues(input.columns):

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