type_traits: add todo item to improve the detection and implementation of multipliable terms.
pyranha: minor style fix in exception throwing.
pyranha: add support for interoperability with sympy's Float.

sympy's Float seems to be just a thin wrapper around mpmath's mpf.
small_vector: a minor reporting change in the test.
pyranha: small fix for Python 3 compatibility.

A method returning a list in Python 2 returns something convertible to a list in Python 3.
hash_set: just a minor comment fix.
Merge branch 'master' of gitorious.org:piranhapp0x/mainline
small_vector: a couple of simplifications and a comment update.
build_system: fix build of main, library linking was missing.
Initial tmp commit with files for the new integer class.
build_system: fix build of main, library linking was missing.
new_integer: fix the multiply_accumulate and a couple of minor additions to the performance testing.
new_integer: some infrastructure work and new files for the new integer class.
Just a couple of minor fixes spotted from previous commits.
piranha.hpp: add a couple of todos.
new_integer: chunk of work on features implementation and testing.

Includes:
- constructor from integral types,
- bit setter,
- conversion to GMP integer,
- streaming operator.
new_integer: use std::array for storing the limbs and implement comparison operators.
new_integer: more implementation and testing work, with a fix for braindamage in the comparison operator.

Addition routine still needs work.
new_integer: a couple of minor fixes in test for GCC 4.7.
new_integer: some work on the add function.