Fix #5519 (CC Beta: opening a library on non-existent network path hangs) and add EPUB formatting demo to User Manual

src/calibre/gui2/main.py

@@ -73,7 +73,7 @@ def get_library_path():
         except:
             error_dialog(None, _('Failed to create library'),
                     _('Failed to create calibre library at: %r. Aborting.')%library_path,
-                    det_msg = traceback.print_exc(), show=True)
+                    det_msg=traceback.format_exc(), show=True)
             library_path = None
     return library_path
 

src/calibre/manual/conversion.rst

@@ -533,3 +533,17 @@ The .cbc file will then contain::
 
 |app| will automatically convert this .cbc file into a e-book with a Table of Contents pointing to each entry in comics.txt.
 
+
+EPUB advanced formatting demo
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Various advanced formatting for EPUB files is demonstrated in this `demo file <http://calibre-ebook.com/downloads/demos/demo.epub>`_.
+The file was created from hand coded HTML using calibre and is meant to be used as a template for your own EPUB creation efforts. 
+
+The source HTML it was created from is available `here <http://calibre-ebook.com/downloads/demos/demo.zip>`_. The settings used to create the
+EPUB from the ZIP file are::
+
+    ebook-convert demo.zip .epub -vv --authors "Kovid Goyal" --language en --level1-toc '//*[@class="title"]' --disable-font-rescaling --page-breaks-before / --no-default-epub-cover
+
+Note that because this file explores the potential of EPUB, most of the advanced formatting is not going to work on readers less capable than |app|'s builtin EPUB viewer. 
+

src/calibre/web/feeds/news.py

@@ -1266,7 +1266,7 @@ class BasicNewsRecipe(Recipe):
                 feed = Feed()
                 msg = 'Failed feed: %s'%(title if title else url)
                 feed.populate_from_preparsed_feed(msg, [])
-                feed.description = unicode(err)
+                feed.description = repr(err)
                 parsed_feeds.append(feed)
                 self.log.exception(msg)