Performance on contengency and matching tables computating

[Nolife999]

Hello friends

The creation of the contengency table calculation and of the matching table cannot really exceed 100'000 of records or it hit performance and memory problem.

100'000 of records is really too little for our linkages. Most of the files we are processing with linkage process would weight about 2Go and hit 10 millions of line.

[Nolife999]

I will make a branch to make some simple tries on this issue.