implemented FSMTransition.__lt__ and FSMState.__lt__

in order to have default ordering, usable e.g. in doctests.
deepcopy + reset label in FiniteStateMachine.quotient

in quotient, do not create new state, but make deepcopy + reset label in order to capture possible additional information
Removed Whitespace according PEP 8
FiniteStateMachine.set_coordinates (new convenience function)

Set coordinates of the states for the LaTeX representation by a dictionary mapping
labels to coordinates.
Inserted DocTest: No Simplification for non-deterministic Transducers.
Simplification for non-deterministic transducers via Moore's algorithm

In fact, the old code was already able to do that. The check of deterministic
finite state machine has been moved to minimization of Automata, because it
is still required there. Otherwise, the docstrings have been adapted to
explain this generalization.
Corrected docstring formatting for FiniteStateMachine.set_coordinates
rewrote docstring of .__lt__ in FSMState/FSMTransition; corrected spacings
set_coordinates rewritten

renamed parameter `d` to `coordinates`;
using .iterstates() now;
simplified by using enumerate(...);
added parameter `default`;
whitespaces (PEP8)
allowing functions as argument in finite_state_machines.set_coordinates()
corrected spacings (PEP8); added line-breaks in long lines
description of equivalent states rewritten
docstring in quotient adapted to the same style as equivalence classes
small changes in docstring of _minimization_Moore_
using relabeled instead of deepcopy (former TODO)
added one spaceing (PEP8)
Whitespace correction in FSMTransition.__lt__
insert "or a function" in short docstring
separate absolute from local (implicit relative) imports

3 modules in sage/misc are affected:
- copying.py: split 'os' from local 'pager'
- interpreter.py: delete local 'log' which was not used
- sage_timeit.py: split local imports from standard library imports
Added destruction of pool in parallel_iter

Added destruction of pool in parallel_iter in sage/parallel/mulitprocessing_sage.py