Fix several compilation/runtime errors #78
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Note: using gcc version 11.4.0
This caused a compilation error. Note: using gcc version 11.4.0
In C++, declaring a return value but not returning anything is unspecified behavior. Several functions/methods in this library are doing this, and in my case, it's causing a nasty SEGV to occur in unrelated Eigen code (probably because the program counter is falling of the end of the function and executing the unrelated Eigen code that happens to be below!). This is bad, so let's actually return (unused) values from these functions. Note: using gcc version 11.4.0
Currently, the project's CMakeLists.txt specified C++11, which is causing a PCL compilation error. Using C++14 instead causes a SEGV due to Eigen alignment issues (see https://eigen.tuxfamily.org/dox/group__DenseMatrixManipulation__Alignement.html). Upgrading to C++17 fixes these and allows the library to compile and run without segfaulting. Note: using gcc version 11.4.0
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