fixes in javadoc
Merge branch 'master' of ssh://git.dcc.fc.up.pt/yap-6.3
 looking at operators.
make writeln a C built-in.
keep three modules, just for imported stuff.
fix operators.
module stuff
fix message display time
fix typos
fix typos
fix typos
move modules to as early as possible
Merge branch 'master' of ssh://git.dcc.fc.up.pt/yap-6.3