Update the version number to "1.3.0 (Dev)"
[Utils] Add nbCategories() and nbProperties() methods to the 'PropertiesList' class
[Utils] Add remove*() methods to the 'PropertiesList' class
[Unittests] Rename the files to be more in line with the rest of the Athena modules
Update the version number to 1.2.1
Version 1.2.1