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MASTER_SITES -> MASTER_SITE_SOURCEFORGE; part 2/4. Let me know if this
breaks anything. Minor formatting and HOMEPAGE fixes in some files.

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Drop superfluous PKG_DESTDIR_SUPPORT, "user-destdir" is default these days.
Mark packages that don't or might probably not have staged installation.

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Update MAINTAINER

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Import pcp-2.2 as wip/pcp.

PCP (Pattern Classification Program) is an open-source
machine learning program for supervised classification
of patterns (vectors of measurements).

PCP implements the following algorithms and methods:

* Fisher's linear discriminant
* dimensionality reduction using Singular Value Decomposition
* Principal Component Analysis
* feature subset selection
* Bayes error estimation
* parametric classifiers (linear and quadratic)
* least-squares (pseudo-inverse) linear discriminant
* k-Nearest Neighbor (k-NN)
* neural networks (Multi-Layer Perceptron (MLP))
* Support Vector Machine (SVM) algorithm
* SVM, MLP and k-NN model selection
* cross-validation
* bagging (committee) classification