Release Name: 1.7.3

gPM v1.7.3

Changes in v1.7.3
-----------------

Major bug fixes :

* (Bug 957): Empty attribute is saved null in DB.

* Bug on sheet creation for PostGreSQL

* (DM 204) Problem of compatibility with Firefox 3.5.2

* Export (Serialization tools) :
    - Operator 'not like' is not exported
    - Impossible to export a filter with date, real or boolean in criteria
    - Impossible to export a filter with empty date in criteria
    - Impossible to export an empty attached file