Release Name: v1.6.4

Changes in v1.6.4
-----------------

This release fixes a nasty bug introduced in v1.6.3 that sometimes prevent any update of a sheet. (no error reported, but the sheet data is not updated in database).

This release features also additional methods added to WS API.

Note: it is fully compatible with the v1.6.2 & v1.6.3 releases.

Consult the 'CHANGES.txt' file included in the packages for a comprehensive list of changes included in this release.