Progress with module support

1. Now, the call to ./main.byte produces three files:
        - a (buggy) logged version
        - a version without annotation
        - the Format that is being used (for debug purpose).

2. Modules are quite soapy to handle:
        - Name shadowing (supported).
        - Inclusion of opened modules (no log information is
                included)
        - Accessed but not opened modules (kind of break the
                default parameters handled with attributes).