renaming PLNPCA to PlnPCAcollection and _PLNPCA to PlnPCA. Now PlnPCA is
public. PlnPCAcollection is a collection, I implement all the required methods such as getitem etc, and wrote tests for it.
public. PlnPCAcollection is a collection, I implement all the required methods such as getitem etc, and wrote tests for it.
merged
mentioned in commit 0913c6e7