Fix SAAMG headers
For #482 (closed)
The multigrid solver was originally developed by Yves Ineichen in MSc thesis not PhD (see comment !327 (comment 20157)), as part of this work: http://amas.web.psi.ch/people/aadelmann/ETH-Accel-Lecture-1/projectscompleted/math/ineichen.pdf
Edited by snuverink_j