New formulas for converting parameters on HealthSystem page to pSeek parameters

[Baguage]

Per Amanda's email:

1. "The percentage of fevers treated with an antimalarial in a 14 day period"
   -> this gives the total % of fevers treated (from both formal (official health care, health centre, hospital) and informal (shops, self-treat) sources)
   -> this should undergo the transformation Probability_from_percentage (=a)
   The transformation has to happen on the total, rather than the separate percentages
   The transformation just maps the 14day % of treatment to the 5-day % needed for OpenMalaria
2. "The percentage of treatments obtained through formal care" (=b)
   -> then pSeekOfficialCareUncomplicated1 = (b/100) * a
   -> pSelfTreatUncomplicated = ((100-b)/100) * a
   -> pSeekOfficialCareUncomplicated2 = pSeekOfficialCareUncomplicated2 (as a default, it could also be different)