Feature/advanced log

During the process, we store logs in database (sqliimport_item table). When process in over, we display log in the progression notes column of the import list.

Warnings en errors are displayed by default. To display notices, you must click on a link.

![image](https://f.cloud.github.com/assets/1446568/355560/97a2a47e-a0e1-11e2-9579-f77596ff3efc.png)

![image](https://f.cloud.github.com/assets/1446568/355565/b3572cc6-a0e1-11e2-9e1e-f1515dd6e847.png)