Fixes for 3.3.2

…ader file

Prevent inclusion of <sys/sysctl.h> on gnu hurd.

CMake fixes

The current macro tests don't correctly predict if CPUID is available

This allows complex sorting based on a key, which can be the abs, real, imag
etc of the value array. So the user can choose which metric they want to use.

* Sort now allows all dimensions
* Sort if much faster by using batched mode. This takes up more memory though.
* Enabled large tests for sort
* Added tests for sorting on dim1 and dim2

This reverts commit 98e023d.

User can still set it on in CMake

Disable CPU Async if GCC Version is less than 4.8.4

If static freeimage lib comes prior to static MKL libs, then there is a
duplication of math symbols like sqrtf, ceilf etc which will cause the builds
to fail at link time

…istic

Improvements to sort functions

BUILD: Add options to build deb and rpm packages on demand

- Makes it cleaner / consistent
- More importantly, gets rid of annoying messages from -Wpsabi in gcc 5.3

* When bre install fails, the installer will give pop up messages.
* It will also open the web page to the wiki entry
* Although all 3 scripts have the same error handling, only the first one will
  be executed.
* Added missing opencl script entry

Release 3.3.2 Updates