- new path to ag-common

- do not hardwire the 3d material parameters
- add method to create a straight initial rod
- remove Neumann damping
- remove anisotropic damping
- do not hardwire the rod material and shape parameters
- use the C++ IPOpt, if requested
- use absolute corrections size for termination
- better determination of the overall convergence rate

[[Imported from SVN: r2018]]