3PARAMETER datum transformation method produces results which are a meter or two off

[hugueswski]

There is a coding error in the 3PARAMETER datum transformation method that produces results which are a meter or two (depending on the datum and position) off.

The bug can be seen in CS_dtcalc.c at line 958: parm3->srcESqr = srcDatum->ecent * trgDatum->ecent; should be: parm3->srcESqr = srcDatum->ecent * srcDatum->ecent;

Fixing the bug is trivial, but we'll need to: 1) leave the defective 3PARAMETER transformation in place as a LEGACY object and add a new transformation named GEOCENTRIC; 2) replace all the affected systems.

This affects 65 datum definitions and 600 coordinate system definitions which reference the 3PARAMETER definitions