Fix some compiler warnings
See merge request !3103 (merged)
(cherry picked from commit 26409a96)
688fc288 [fix] use math.hh instead of power.hh f51406bd [fix]remove warning in constructor 017e443b [el2p] reuse CO2 table
Fix some compiler warnings See merge request !3103 (cherry picked from commit 26409a96) 688fc288 [fix] use math.hh instead of power.hh f51406bd [fix]remove warning in constructor 017e443b [el2p] reuse CO2 table