* Modified the parsing procedure to upload into FS also those files in the UoL ZIP that are not referenced as resources in the imsmanifest. All images and additional files linked from an HTML page were not uploaded because they do not appear as resources in the manifest.
* Fixed a few bugs when handling file properties. Also, personal properties are now created in a sub-folder in the FS to facilitate its identification.
improving the algorithm used to display the activities tree, taking into account more possible cases (the completion restriction of the activities, etc) adding an "eye" icon to the activities that have been viewed using bold letters to indicate that the activity hasn't been started fixing bugs