Revise ImportJuliaModuleIntoGAP

[fingolfin]

@sebasguts came up with the following plan: the global variable Julia will point to a custom GAP object, for which methods for \. and IsBound. (and possibly RecNames) are installed. When accessing Julia.foobar, it queries if Main.foobar exists; if not, it errors out, otherwise that object is returned.

On the next level, Julia module objects (i.e., jl_module_t) are wrapped into custom GAP objects (similar or even identical to the Julia object). Then for these the \. method of course performs the lookup relative to the jl_module_t (in the Julia object, this would then be jl_main_module).

[sebasguts]

This is resolved by #62