Rename inconsistent variables

[mdbartos]

Orifices

• [ ] _Ao_max -> _A_o_max
• [ ] _Ao -> _A_o
• [ ] _Co -> _C_o
• [ ] _Qo -> _Q_o

Weirs

• [ ] _Cwr -> _C_w_r
• [ ] _Cwt -> _C_w_t
• [ ] _Hw -> _H_w
• [ ] _Qw -> _Q_w

Pumps

• [ ] _dHp_max -> _dH_p_max
• [ ] _dHp_min -> _dH_p_min
• [ ] _Qp -> _Q_p