TXT Output: clean ascii characters. Textile output remove span attributes.

src/calibre/ebooks/txt/output.py

@@ -15,6 +15,7 @@
 from calibre.ebooks.txt.txtml import TXTMLizer
 from calibre.ebooks.txt.newlines import TxtNewlines, specified_newlines
 from calibre.ptempfile import TemporaryDirectory, TemporaryFile
+from calibre.utils.cleantext import clean_ascii_chars
 from calibre.utils.zipfile import ZipFile
 
 class TXTOutput(OutputFormatPlugin):
@@ -79,6 +80,7 @@ def convert(self, oeb_book, output_path, input_plugin, opts, log):
             writer = TXTMLizer(log)
 
         txt = writer.extract_content(oeb_book, opts)
+        txt = clean_ascii_chars(txt)
 
         log.debug('\tReplacing newlines with selected type...')
         txt = specified_newlines(TxtNewlines(opts.newline).newline, txt)

src/calibre/ebooks/txt/textileml.py

@@ -41,6 +41,7 @@ def mlize_spine(self):
                 html = re.sub(r'<\s*img[^>]*>', '', html)
 
             text = html2textile(html)
+            text = text.replace('%', '')
 
             # Ensure the section ends with at least two new line characters.
             # This is to prevent the last paragraph from a section being