Path evaluation on C++ not updated before the results go back to C

[cvvergara]

Describe the bug
While developing I found that there is a small bug on the Path class, and the total cost is not updated properly
As far as I can see affects some functions:

• bellman_ford_driver.cpp
• dijkstra_driver.cpp
• pgr_ksp.hpp

To Reproduce
Very difficult to reproduce, but from this test execution:

"SELECT  seq, path_seq, node, edge, cost, agg_cost FROM pgr_turnrestrictedpath($$SELECT id, source, target, cost, reverse_cost FROM edge_table$$, $$SELECT * FROM new_restrictions WHERE id > 10$$, 12, 13, 3, false)"
#     Extra records:
#         (2,2,11,12,1.144,1.1689999999999998)
#     Missing records:
#         (2,2,11,12,1.144,1.169)

(2,2,11,12,1.144,1.169) ss expected as result of dijkstra
But this is obtained: (2,2,11,12,1.144,1.1689999999999998)
and 1.169 compared with 1689999999999998 is "almost" the same value so there is floating point arithmetic issue.

Expected behavior

"SELECT  seq, path_seq, node, edge, cost, agg_cost FROM pgr_turnrestrictedpath($$SELECT id, source, target, cost, reverse_cost FROM edge_table$$, $$SELECT * FROM new_restrictions WHERE id > 10$$, 12, 13, 3, false)"
#     Extra records:
#         (2,2,11,12,1.144,1.169)
#     Missing records:
#         (2,2,11,12,1.144,1.169)

To get the expected results

Sample Data
Using the sample data of the documentation

Specifications (please complete the following information):
Fix & release:

• 3.0.3 version
• 3.1.1 version
  and fix:
• 3.2.0-dev

[dkastl]

This issue is mentioned in https://github.com/pgRouting/admin/wiki/MOTION-2:-Stop-2.x-series-support