Released the version 0.1.2.1 of JClic

Three main changes have been done in this update:

- Feature request #68: In the reports system, the 'content-type' header of the HTTP responses is now "text/xml". This facilitates the integration with PHP-based applications, like Moodle. See http://projectes.lafarga.cat/projects/jclicmoodle for more information about a project that makes use of this feature.

- A new automation module, called "TagReplace", has been created. This module allows to substitute designed tags written in text elements by its associated values, indicated by means of an external text file or URL.

- Feature request #45: JClic Author can now transfer activities between different JClic projects. The "Import activities" feature allows to add to the current project activities taken from another one.