Started creating "pure path" sign symbols

These symbols are based on the original Cantarell symbols, but instead of
creating filled paths, these utilize only single paths that hase to be
stroked. This way, changing the stroke-width value is enough to make the
sign emphasized.

images/sign_cancer_purepath.svg

@@ -0,0 +1,72 @@
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+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
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+        <dc:title />
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