fix sheBangs for python3

A lot a smalls things on msys2/mingw64 config :

• Fix shebang to python3
• port to mingw64 (msys2) : minor changes
• remove the old (unusable anymore luc.cmake)

CMake/luc.cmake

-# Copyright 2020 University of Liège
-# 
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-# 
-#     http://www.apache.org/licenses/LICENSE-2.0
-# 
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-
-#defining generator
-SET(CMAKE_GENERATOR  "Visual Studio 11 Win64" CACHE INTERNAL "" FORCE)
-
-#Libs Directory
-STRING(REGEX REPLACE "\\\\" "/" MYLIBS $ENV{METAFORLIBS})
-
-#Libs
-SET(SWIG_EXECUTABLE "${MYLIBS}/swigwin/swig.exe" CACHE FILEPATH "" FORCE)
-
-SET(PYTHON_INCLUDE_DIR   "${MYLIBS}/Python/include"             CACHE PATH "" FORCE)
-SET(PYTHON_LIBRARY       "${MYLIBS}/Python/Libs/python27.lib"   CACHE FILEPATH "" FORCE)
-SET(PYTHON_DEBUG_LIBRARY "${MYLIBS}/Python/Libs/python27_d.lib" CACHE FILEPATH "" FORCE)
-
-SET(MKL_LIB_PATH      "${MYLIBS}/intel/mkl/lib/intel64" "${MYLIBS}/intel/compiler/lib/intel64" CACHE PATH "" FORCE)
-SET(MKL_INCLUDE_PATH  "${MYLIBS}/intel/mkl/include"  CACHE PATH "" FORCE)