Use more SOLPS data when available

[vsnever]

Currently, the following useful data are extracted from the SOLPS files, but not used when creating a plasma object:

• neutral density (from EIRENE, see Plasma from raw files should use Eirene neutral density if available #31),

• effective neutral temperature (from EIRENE),

• ion temperature (from B2),

• parallel velocities (from B2),

• magnetic field vector (from b2fgmtry),

• total (molecular and atomic) H-alpha emission (from EIRENE).

The total H-alpha emission is a separate issue, because it may require changing the plasma object. Implementing the usage of other quantities from this list when creating the plasma object should be relatively easy. Currently, for neutral atoms the Maxwellian distribution is created with the electron temperature, which at the edge can be an order of magnitude higher than the effective temperature of atoms. The electron temperature is used also for ions even if the ion temperature is available.