Relocate wiki from trac

wiki/help/tasks/pca.md

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+# Principal Component Analysis
+
+The principal component analysis (PCA) task.
+
+## Input
+
+## Options
+
+## Output
+
+- Score matrix
+- Loadings matrix
+
+## Plots
+
+- Score plot
+- Loadings plot
+- Profiles

wiki/help/tasks/pls.md

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+# Principal Component Analysis
+
+The principal component analysis (PCA) task.
+
+## Input
+
+- X
+- Y
+
+## Options
+
+
+## Output
+
+- Score matrix
+- Loadings matrix
+
+## Plots
+
+- Score plot
+- X loadings plot
+- Y loadings plot
+- Profiles