Move global var down with the others.

Code org.
Single threaded init of singleton constants.

undefined, done and ellipsis initialised in the gracelib_argv function.
iomodule and sysmodule are still initialised in their own place (not
sure if valid to initialise them early in the program).
Single threaded init of constants.

BOOLEAN_* and FLOAT64_*.
Single threaded init of "default objects".

Namely GraceDefaultObject, Unknow, Dynamic and List.
Moved all globals to the top of the file.

General org.
Singled threaded init of misc.

Some forgotten ClassData and Objects that could be initialised like the
others were added. Mostly, it is the ones that were not originally
defined at the top of the file.