Third Debian package pre-release

This is the third Debian package for KiCost.
Is intended for testing the package and solve any packaging problems.
Please report any use (success or fail)

This release fixes problems with multiparts and exports KiCost functionality (used in KiBot).

Note that python3-babel is not part of Debian, so you should also install the provided package.
Also note that python3-validators is not part of Debian stable, use the provided package.