utils: format of the Description.txt file

The id of a package in the description files is required to be an alpha
character. Instead, one should use the isalnum function (Closes #118).
gvle: update the Project menu

remove the "Build All" menu item and add a "RemoveBinaryProject" item.
(Closes #84)
vle: remove debug message

Remove debug message and split source code at the 80th column.
vle: improve error message with std::exception