[Ipopt] Ipopt 3.13 beta

[Stefan Vigerske]

Hi,

the current Ipopt master branch now contains a preliminary version for 
Ipopt 3.13.0. This release comes with a larger renovation of the build 
system and a changed directory structure (eliminated the top directory), 
which is the result of a long and still on-going effort to use recent 
autotools versions for various COIN-OR projects, reduce future 
maintenance efforts, and adapting behaviors of standard autotools-based 
projects.
As a consequence, a monolithic build of Ipopt, which builds Ipopt with 
all its dependencies in one run of configure and make is no longer 
possible. Dependencies should now be build and installed before building 
Ipopt.
Additionally, support for some outdated versions of dependencies and 
unmaintained components of Ipopt have been dropped and some improvements 
that may require changes on the users side have been applied.
A more detailed, probably incomplete, list of changes is found in 
Ipopt's changelog: https://github.com/coin-or/Ipopt/blob/master/ChangeLog

A build of the documentation for this not-yet-released version of Ipopt 
is temporarily available at http://www.zib.de/vigerske/ipopt3.13/

Stefan