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Support numerical factors only #664
Support for the "special" entry of PJ, which enabled PROJ.4 to compute analytically derived, rather than numerically approximated, values for a. o. scale factors and convergence, was limited to the
And for the past 20 years, the need for that functionality has not been so huge as to animate anyone to implement it for more than those two projections - so the need is apparently limited.
It could even be argued that it is more relevant to get the numerical approximation for the actually implemented algorithm, than the analytically derived values for the mathematical abstract version.
Removing the feature simplifies the code a bit, and also reduces the documentation needed to be written a comparative bit.
Note: This PR does not touch the availability of the convergence, etc. computations - it just results in treating all projections equal, by using numerical approximation even in those two cases that formerly provided analytical versions.
@kbevers : they are indiscernible to within the number of decimals provided by
(bin\proj is the numerical version, proj is the older supporting analytical)