Convert calibre modules to ebook_converter.

Here is the first batch of modules, which are needed for converting
several formats to LRF. Some of the logic has been change, more cleanups
will follow.

ebook_converter/utils/__init__.py

@@ -1,56 +0,0 @@
-#!/usr/bin/env  python2
-
-from __future__ import absolute_import, division, print_function, unicode_literals
-
-__license__   = 'GPL v3'
-__copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
-__docformat__ = 'restructuredtext en'
-
-'''
-Miscelleaneous utilities.
-'''
-
-from time import time
-from polyglot.builtins import as_bytes
-
-
-def join_with_timeout(q, timeout=2):
-    ''' Join the queue q with a specified timeout. Blocks until all tasks on
-    the queue are done or times out with a runtime error. '''
-    q.all_tasks_done.acquire()
-    try:
-        endtime = time() + timeout
-        while q.unfinished_tasks:
-            remaining = endtime - time()
-            if remaining <= 0.0:
-                raise RuntimeError('Waiting for queue to clear timed out')
-            q.all_tasks_done.wait(remaining)
-    finally:
-        q.all_tasks_done.release()
-
-
-def unpickle_binary_string(data):
-    # Maintains compatibility with python's pickle module protocol version 2
-    import struct
-    PROTO, SHORT_BINSTRING, BINSTRING = b'\x80', b'U', b'T'
-    if data.startswith(PROTO + b'\x02'):
-        offset = 2
-        which = data[offset:offset+1]
-        offset += 1
-        if which == BINSTRING:
-            sz, = struct.unpack_from('<i', data, offset)
-            offset += struct.calcsize('<i')
-        elif which == SHORT_BINSTRING:
-            sz = ord(data[offset:offset+1])
-            offset += 1
-        else:
-            return
-        return data[offset:offset + sz]
-
-
-def pickle_binary_string(data):
-    # Maintains compatibility with python's pickle module protocol version 2
-    import struct
-    PROTO, STOP, BINSTRING = b'\x80', b'.', b'T'
-    data = as_bytes(data)
-    return PROTO + b'\x02' + BINSTRING + struct.pack(b'<i', len(data)) + data + STOP