Support for the IEEEeqnarray and IEEEeqnarray* environments

Created by: jmhammond

Is your feature request related to a problem? Please describe. One of the professors in my department makes heavy use of the IEEEtran package in his works, specifically because he prefers using the IEEEeqnarray and 'd environments for more control over his layouts than align provides.

Describe the solution you'd like Include support for the layouts of the IEEEeqnarray and IEEEeqnarray* environments.

Describe alternatives you've considered Although align* is functionally similar, his preference is to be able to multiple aligned pieces that IEEEeqnarray provides. I told him I'd ask if here if it would be useful

Additional context Minimal working document:

\documentclass{article}
\usepackage{IEEEtrantools}
\begin{document}

\begin{IEEEeqnarray*}{rCcCl}
  a& \le & b & \le & c \\
  d &\le & e &\equiv & f
\end{IEEEeqnarray*}

\end{document}

renders:

nicely aligned with each &.