Improve exception safety with smart pointers

[elfring]

Would you like to wrap any pointer data members with the template class "std::unique_ptr"?

Update candidates:

• HTTPServer
• main
• ORBWordIndex

[magwyz]

Won't fix

[elfring]

Do you really prefer to keep a broken software implementation (instead of improving its robustness)?

[magwyz]

Could you elaborate on why this code is broken?

Thank you

[elfring]

• With which pointer values will the delete operators be eventually called in the ORBWordIndex destructor for example if one of the previous new operator calls would throw the exception “std::bad_alloc”?
• Do you care for complete clean-up of involved system resources?