Cleaned some comments
Included new system call, such as access, stat and readlink.
Included a verbose method; removed readlink from the traced probes.
Updated README file with information about VMs; included scripts to remove old SystemTap files and to drop ReproZip collections in MongoDB.
Updated README file.
Updated README file; ignoring files from some specific directories, such as /dev/; when copying files to package, ignoring files that do not exist.
Fixed a variable assignment.
Updated README file.