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Merge pull request #108 from eggrobin/unicode

Unicode
Update Setup.md
standardise a little
M_PI is nonstandard.
standardise more things
Don't redefine default template args
clang warnings
include guards
Reorder includes
unicode
Merge pull request #112 from eggrobin/minor-cleanup

Minor cleanup
Merge pull request #109 from eggrobin/setup

Update Setup.md
After pleroy's review
Merge branch 'master' into standard

Conflicts:
	geometry/affine_map.hpp