Only calls that require space allocation are to be changed.

The free handler of code dumper extensions was never executed.

Reported by Coverity.

Also contains a few other small fixes by Timo.

Added the concept of a script code header to list the extensions actually used by a script (was using all extensions listed in the binary).

Properly implemented dumping a binary including a list of required extensions and support for extension-specific output.

RECOVERED FROM INCONSISTENCY: developed testsuite and binary dumping and fixed various small issues.