fix clang warnings and errors

[Steven Hahn]

Both a new compiler warning and error was recently introduced on master.

15:44:20 /Users/builder/jenkins-linode/workspace/master_clean-clang/label/osx-10.9-build/Code/Mantid/Framework/Kernel/src/InternetHelper.cpp:137:35: error: invalid operands to binary expression ('std::ostream' (aka 'basic_ostream<char>') and 'std::ostringstream' (aka 'basic_ostringstream<char>')) 15:44:20 session.sendRequest(*m_request) << m_body;

02:59:12 /Users/builder/jenkins-linode/workspace/master_clean-clang/label/osx-10.9-build/Code/Mantid/MantidQt/CustomInterfaces/src/Indirect/IndirectSymmetrise.cpp:278:14: warning: equality comparison with extraneous parentheses [-Wparentheses-equality] 02:59:12 if((prop == m_propertiesPreviewSpec?))

[Steven Hahn]

Refs #11110. Fix compiler error and warning on AppleClang

Changeset: 029132cc2a45889d38f4b220f14fcd63c456c1bc

[Steven Hahn]

This is being verified as ​pull request #232.

[Steven Hahn]

fix for compiler error: ​http://stackoverflow.com/questions/18448846/c11-invalid-operands-to-binary-expression-ostream-and-ostringstream

[Steven Hahn]

Refs #11110. switch from rdbuf() to str()

Changeset: 0f3df5223605eb54b31933f8516b5b3ada805e4e

[Wenduo Zhou]

The change fixed the issue.

[Wenduo Zhou]

Merge pull request #232 from mantidproject/feature/11110_fix_clang_error

Fix compiler error and warning on AppleClang

Full changeset: ​f988bd4cac731a239969cebe8248e9052f1969b9

[Nick Draper]

Somehow these slipped through without a resolution. Set to Fixed.

[Stuart Campbell]

This ticket has been transferred to github issue ​11949