practracker: use shutil.move so --regen will work on windows

import util

import problem

import includes

import shutil

# The filename of the exceptions file (it should be placed in the practracker directory)

EXCEPTIONS_FNAME = "./exceptions.txt"

    if args.regen:

        tmpfile.close()

        os.rename(tmpname, exceptions_file)

        shutil.move(tmpname, exceptions_file)

        sys.exit(0)

    if args.regen_overbroad:

        for item in ProblemVault.list_exceptions_without_overbroad():

            print(item, file=tmpfile)

        tmpfile.close()

        os.rename(tmpname, exceptions_file)

        shutil.move(tmpname, exceptions_file)

        sys.exit(0)

    # If new issues were found, try to give out some advice to the developer on how to resolve it.