Adding initial code framework for 4-series airfoil creator
Changed default behavior so that first three elements passed in to constant spacing central spacing case will be used.
Added d2o2.hpp to project.
Thickness support tested for 4-series.
Camber equation needs to account for the fact that parameterization goes from -1 to 1: lower trailing edge to upper trailing edge
Thickness tests completed.
Added test of general 4 digit airfoil coordinates.
Reimplemented derivative calculations to reduce numerical errors.
Added tests for general 4-digit airfoil coordinates and derivatives.
Renamed 4 series to 4 digit for naming correctness.
Created pseudo namespace for pseudo-curves (curves that only support subset of all curve functionality). Renamed/moved files to match the four digit nomenclature. Split the pseudo::airfoil test from the piecewise_four_digit_creator test.
fixed subtle bug that would arise when differentiating uniform spaced data.
Fixed compilation errors in gcc.
Fixed improper include file.
Removed unused typedef.
Merge branch 'feature/Four_Series_Airfoil_Creator' into develop