Rename parameters hft.life_history.physical_maturity*

[wtraylor]

Currently, there are two parameters hft.life_history.physical_maturity_female and hft.life_history.physical_maturity_male.

The naming is inconsistent with hft.body_mass.male and hft.body_mass.female. It would make more sense to have male and female as sub-parameters of physical_maturity (separated by a dot).

Then we can also write it concisely like this:

[hft.life_history]
physical_maturity = { female = 3, male = 3}

For backward compatibility, the old names should still be valid but marked as deprecated. Internally, the member names of class Fauna::Hft don’t need to be changed because in the member variable names the dots are replaced with underscores anyway.