Version 1.2+
-----------

Better support for mathematical functions:
http://en.wikipedia.org/wiki/C_mathematical_functions
http://www.cplusplus.com/reference/cmath/
Remaining to be added: atan2, hypot, tgamma, lgamma, fdim, fmax, fmin, fma


Wishlist for 2.x
----------------

Replace traits

To support large codes better, provide a memory model that does not
require the statement and operation stacks to present as a single
block of memory, but allow them to be partioned into many smaller
blocks.

Complex number support.

Support for mixed precision, e.g. rather than adouble, use
active<double> and active<float>.

Interface to a matrix/vector library that uses expression templates.

Automatic differentiation of MPI programs

Higher-order differentiation, in particular to compute the Hessian
matrix.

