Change all fabs() calls to std::abs,change math.h to cmath

Hi,

This fixes a compilation error with gcc 6.2:

/tmp/smh/acts/newacts/acts/Core/include/ACTS/Propagator/Propagator.hpp:192:25: error: there are no arguments to ‘fabs’ that depend on a template parameter, so a declaration of ‘fabs’ must be available [-fpermissive]

although I changed many more instances than necessary, to have a consistent codebase. Closes ACTS-239.

Cheers, Stewart

This merge request does not close a JIRA ticket. Please consider creating a JIRA ticket to describe your changes. This is important for generating a complete ChangeLog for the next release.

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• 66c9eb01 - clang-format: enforce code style [ci-skip]

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test coverage result:
Overall coverage rate:
lines......: 17.1% (1591 of 9285 lines)
functions..: 30.1% (683 of 2269 functions)

full test results can be found here

doxygen output:
0 errors
29 warnings
full doxygen output can be found here

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Status changed to merged

Mentioned in commit bc95bd75