ddemidov/amgcl — pull request #8 by ddemidov (2014-11-20 20:56:58+00:00)
Title: This handles good breakdown in bicgstab(ell)

The breakdown may occur if solution obtained on a previous iteration of
Bi-CG part bicgstab(ell) is exact. This may happen if amg hierarchy
consists of a single level (that is, the problem is too small).