jForms/js: remove error report on group and choice in some case

When children of group or choice were in error, there was an
additional error on the group or choice. this is useless.
Chmod is now done on all files created by Jelix
Release Jelix 1.6.2
Bumped version to 1.6.3pre.SERIAL
Fix some files should not be executable
Fix chmod on the compiled ini file