Don't have a fixed 100kb sizelimit for the xml footer anymore.

[ursg]

Instead, read in 4kb blocks in a loop until the end of file.

[ykempf]

But that was a 1MB limit, not 100 kB...

[ursg]

Ah, well, anyway. The important part is that the limit is now longer there, isn't it?

Realistically, our xml footers will never exceed it anyway. But since it came up in a discussion, we might as well do this right.

[ykempf]

Sure, fine with me if yo say it works in your tests.

[alhom]

PR necromancy! Thought this was a quick merge, but...

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/proj/mjalho/analysator/pyVlsv/vlsvreader.py", line 157, in __init__
    self.__read_xml_footer()
  File "/proj/mjalho/analysator/pyVlsv/vlsvreader.py", line 353, in __read_xml_footer
    xml_data += chunk
TypeError: can only concatenate str (not "bytes") to str