Add option to pass huge_tree to XMLParser when using lxml

[cwieken]

Define custom XMLParser() with huge_tree parameter when reading from file.
This allows handling of large junit result files when using lxml.

[weiwei]

Just curious: how big are the xml files we're dealing with here?

I would like to merge this. If you could provide some benchmark data for normal and large files, that could be very nice.

Thanks!

[weiwei]

#49 dresses the requirement in a more flexible way. Example:

from lxml.etree import XMLParser, parse
from junitparser import JUnitXml

def parse_func(file_path):
    xml_parser = XMLParser(huge_tree=True)
    return parse(file_path, xml_parser)

xml = JUnitXml.fromfile('/path/to/junit.xml', parse_func)
# process xml...

Closing this now.