Changes compared to version 2.4

o  truncate bug fixed
o  Multi line if with hanging comment works now
o  Add files command
o  Fixed bug in expression parser
o  OPTION BASE bug fixed
o  Matrix inversion test improved
o  WIDTH 0 bug fixed
o  Missing error check on multi assignments added
o  Wrong FOR loop management fixed
o  Replaced wrong int assignment with long assignment for integers
o  unnum bugs fixed
o  HP-UX build works again
