debugger entry points

[pmp-p]

all compiler or runtime errors that could happen at various stage of using "mys" command, if able to get a source filename, maybe a line number and optionnal colummns + an error message should adress a call to a function (eg builtins.mys_debug ) loaded from a module that could be overridden from command line eg :

--debug=mymodule

try:
    __import__(mymodule)
except:
    def mys_debug(*argv,**kw):
        pass # or the default fancy display with colors as an example.
    import builtins
    builtins.mys_debug

this is mainly for interacting with IDE and/or when compiling remotely to give a translated filename.