bicgstab and reliable updates (does not check maxresincrease)

[mathiaswagner]

It seems like bicgstab does not have a parameter maxResIncrease like the CG so if one uses reliable updates with an unreachable tolerance it will iterate until it hits max iterations.

We should check 'feature-parity' for the different inverters.

[mathiaswagner]

Just browsing through the issues and wonder whether we should get a fix for that into 0.7.x ?