fix 'SaveAs' in case of overwriting existing project

Traceback (most recent call last):
File "/home/developer/WorkData/PLC/beremiz/beremiz/BeremizIDE.py", line 959, in OnSaveProjectAsMenu
self.CTR.SaveProjectAs()
File "/home/developer/WorkData/PLC/beremiz/beremiz/ProjectController.py", line 600, in SaveProjectAs
self.SaveProject(old_project_path)
File "/home/developer/WorkData/PLC/beremiz/beremiz/ProjectController.py", line 579, in SaveProject
self._getProjectFilesPath(self.ProjectPath))
File "/usr/lib/python2.7/shutil.py", line 200, in copytree
os.makedirs(dst)
File "/usr/lib/python2.7/os.py", line 157, in makedirs
mkdir(name, mode)
OSError: [Errno 17] File exists: '/tmp/tests/project_files'

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#!/usr/bin/env python

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# -*- coding: utf-8 -*-

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# See COPYING.Runtime file for copyrights details.

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LogLevels = ["CRITICAL", "WARNING", "INFO", "DEBUG"]

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LogLevelsCount = len(LogLevels)

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LogLevelsDict = dict(zip(LogLevels, range(LogLevelsCount)))

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LogLevelsDefault = LogLevelsDict["DEBUG"]