[nem-en] Bugs in extension method implementation

[vc]

   > Ok, I found the real cause of this bug. If Nemerle.Compiler is loaded
   > BEFORE Nemerle.dll, then when analyzing Nemerle.Compiler, the
   > extension attribute is not yet loaded.
   > The problem disappears, when Nemerle.dll occurs in command line before
   > N.C.dll
   
   Dependence on the order of loading assemblies is very bad.
   
   > I'm not sure what is the perfect way to solve this.
   
   Maybe at first load all assemblies, and already only then analyze them?
   
   > For now I will
   > change the order of loading libraries in case of /greedy+  the
   > referenced libs should be loaded before the referencing one.
   
   And what to do without "/greedy+"?