Collection of bug fixes

[economon]

Proposed Changes

Give a brief overview of your contribution here in a few sentences.

• Bug fix for surface-based objectives so that they are not counted multiple times when multiple surfaces are being designed
• Segfault fix for ParaView binary in serial.
• Fixes so that ParaView binary works properly with SU2_SOL (writing ASCII instead) and the python scripts for gradients and shape design
• Fixes line endings of SU2_PY/SU2/run/mergy.py
• Fixes TecIO typecasting issue found in fixed error for 64bit platform during pointer conversion #339
• Removes y^+ output from laminar Navier-Stokes (now RANS only)
• Adjustment to output variables for incompressible flows
• Removes some warnings
• Xcode project file update

Related Work

Resolve any issues (bug fix or feature request), note any related PRs, or mention interactions with the work of others, if any.

Includes fix from #339, which will be closed.
Resolves #62
Resolves #54

PR Checklist

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• I am submitting my contribution to the develop branch.
• My contribution generates no new compiler warnings (try with the '-Wall -Wextra -Wno-unused-parameter -Wno-empty-body' compiler flags).
• My contribution is commented and consistent with SU2 style.
• I have added a test case that demonstrates my contribution, if necessary.

[pcarruscag]

Looks good to me.
@economon thank you for the type cast fixes in the RBF interpolation, do you compile with the Wconversion flag? I am asking because I had no warnings there and was just googling what flags might produce them.

[economon]

It is likely just a compiler-specific thing. The warnings popped up using LLVM on a mac when compiling in serial in Xcode. Not sure if it's related, but it is worth checking for warnings in both pure serial and parallel, since some warnings can appear only within #ifdefs for one or the other.

[vdweide]

For the g++ compiler the following compiler flags are pretty good.
-g -Wall -Wextra -Wno-unused-parameter -Wno-empty-body

As @economon said, do this both in sequential and parallel mode.

BTW, when the regression tests go through this PR can be merged in as far as I am concerned.