Fix intersect lines and polysmooth function #311

Job	Run time
Documentation	8m 55s
Julia 1.9 - ubuntu-latest - x64	4m 6s
Julia 1.9 - macos-latest - x64	5m 2s
Julia 1.9 - windows-latest - x64	7m 32s
Julia 1 - ubuntu-latest - x64	5m 12s
Julia 1 - macos-latest - x64	5m 46s
Julia 1 - windows-latest - x64	6m 9s
Julia nightly - ubuntu-latest - x64	7m 34s
Julia nightly - macos-latest - x64	8m 8s
Julia nightly - windows-latest - x64	10m 35s
	1h 8m 59s

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