rakhimov/scram: Transition to C++17

Release Notes With this release, the codebase transitions to C++17, requiring more modern compilers (gcc 7, clang 5) and dependencies. Minor Changes Transition to C++17 (#250) Replace header guards w/ '#pragma once' (#253) Replace Nose w/ Pytest (#252) Replace GoogleTest w/ Catch2 (#251) Removed Features Non-MEF, API-only random deviates (use STL or Boost random directly). Since v0.16.1 80 commits resulted in 193 files changed, 3321 insertions(+), 4040 deletions(-) Core: 96 files changed, 1061 insertions(+), 1613 deletions(-) Scripts: 1 file changed, 111 insertions(+), 88 deletions(-) GUI: 39 files changed, 240 insertions(+), 443 deletions(-) Tests: 40 files changed, 1724 insertions(+), 1727 deletions(-) Documentation: 4 files changed, 41 insertions(+), 61 deletions(-) Schemas: No change

Impact byBIP!

	selected citations These citations are derived from selected sources. This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).	3
	popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.	Average
	influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).	Average
	impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.	Average