1) Typerank is explained in this long topic about tournament edition : ftopic1322.php&highlight=typerank
TaxesFinal = Taxes ratio in final draw
TaxesQualif = Taxes ratio in qualif draw
StressFinal = stress in final round
StressDelta = stress reduction for succeeding round ; semifinal stress = StressFinal - StressDelta ; quarterfinal stress = StressFinal - StressDelta * 2 ; last 16 stress = StressFinal - StressDelta * 4 ... and so on
Taxes are shown in the weekly result screen.
Stress is used for the score simulation of the CPU players, and is related to their ColdBlood skill.
2) it shouldn't invalidate your current saved games...