b: fix core dump when missing config file
e: updated swig api to remove deprecated code
Fix bug in vishnu_ls in column size of group.
b : Filename with emphasis char are not correctly process
o: removed comments
o: refactoring: rewrite code for simplification
o: refactoring: rewrite sql query using boost format
o: parenthesis
WIP: updated models of machine, users, and refactoring of related code