'Returns a table of format \'subject -> head\'
to display with the table.py module
:param separators: if True, the categories are separated
by extra line.
:param cat: category to include into the page.
If None, all are included.'

def get_plain_help_table(self, separators=True, cat=None):

    result = []
    if (cat is not None):
        self._appendHelpTable(result, cat)
    else:
        for g in self._cat2Subj:
            self._appendHelpTable(result, g)
            if separators:
                result.append([])
        if (len(result) and separators):
            result.pop()
    return result
