Update PHPExcel to solve shared formula bug #2359

Belize, Tables_S!BB102 uses a shared formula with Tables_S!BA102
which was wrongly read by PHPExcel, leading to exception during import
Support non-continuous questionnaires import #2359

Japan sanitation have non-continuous questionnaires. We used to abort import
when a questionnaire was missing, but we now arbitrarly attempt to import
50 questionnaires.
Also import exclude rules for 'Shared' #2359

We previously could not do it properly, but since the introduction
of second level of rules, it is now possible, and more correct, to
also import exclude rules for 'Shared' filter
Import population based on WHO supplied file #2359