0033615: Modeling Algorithms - Partition algorithm creates unexpected vertices

This problem occurs because of obtaining 2 ALines which share same vertex on the seam edge.
There should be 2 different vertices with same(or almost the same) 3d parameters, but
with different UV parameters because of periodic surface.
Current fix allows to avoid the same vertices on seam edge and also checks the next vertex.
Added consideration of predicted next point to avoid skipping tha point which is not on seam edge.
Added test case for #33702

tests/lowalgos/intss/bug29807_i1002

@@ -17,7 +17,7 @@ fit
 
 regexp {Tolerance Reached=+([-0-9.+eE]+)\n+([-0-9.+eE]+)} [bopcurves b1_5 b2_2 -2d] full Toler NbCurv
 
-if { ${Toler} > 0.0004} {
+if { ${Toler} > 0.002} {
    puts "Error: bad tolerance of result"
 }
 

tests/lowalgos/intss/bug29807_i5002

@@ -55,6 +55,6 @@ fit
 checksection result -r 0
 checkmaxtol result -min_tol 2.0e-7
 
-checknbshapes result -edge 3 -vertex 3
+checknbshapes result -edge 2 -vertex 2
 
 checkview -screenshot -2d -path ${imagedir}/${test_image}.png