`I.e.` to `i.e.`
Lowering case of `i.e.` and `e.g.` and adding comma
Skip points with NaNs in point_in_path and friends
Minor fixes
Merge pull request #3759 from mdboom/point_in_path_nan

points_in_path can fail with NaN data
Merge pull request #3751 from yuvallanger/patch-eg-with-dots

DOC : Some more `i.e.` and `e.g.` changes
Merge pull request #3780 from pwuertz/fix_3779

BUG : backend_pgf: \pgftext now requires \color inside argument (fix #3779) [backport to 1.4.x]
Merge v1.4.x into master

Conflicts:
	src/_path.cpp

src/_path.cpp has been deleted on master, need to apply
the changes to fix #3759 to src/_path.h