Trying to improve adaptive linear solver tolerance selection

[paveltomin]

1. Pull out hard-codded params to be able to modify them from input:

- strongestTol = 1e-8 (default value)
- adaptiveGamma = 0.1
- adaptiveExponent = 1.0

2. Adjust altKrylovTol logic. Not sure that new one is good but old one is really confusing.
3. Add output to see what tolerance is selected and why (triggered by logLevel>0 in linear solver params).