An ebuild for p4est [1]

This commit introduces an ebuild for the p4est library.

[1] http://www.p4est.org/

 "The p4est software library enables the dynamic management of a
  collection of adaptive octrees, conveniently called a forest of octrees.
  p4est is designed to work in parallel and scale to hundreds of thousands
  of processor cores."
An ebuild for deal.II [1]

This commit introduces an ebuild for the deal.II library.

[1] http://www.dealii.org/

 "deal.II is a C++ program library targeted at the computational solution of
  partial differential equations using adaptive finite elements. It uses
  state-of-the-art programming techniques to offer you a modern interface to the
  complex data structures and algorithms required."
Improve dealii-9999.ebuild to be more consistent with Gentoo's best practices

Specifically:

  - Rename use flags thread -> tbb, umfpack -> sparse as match common practice
  - Add virtual/pkgconfig to DEPEND
  - Remove double occurence of sys-libs/zlib
  - Provide a static-libs use flag
Clean up the documentation installation: Only install html files if +doc is set
removed paraview-3, paraview-4 in main tree
virtual/cblas: Adapted for new openblas

Package-Manager: portage-2.2.01.22124-prefix
Rewrite the ebuild

  - uses autotools-utils, now
  - introduce a static-libs use flag
  - introduce doc and examples use flags that install corresponding files
    directly from the tarball
Remove files directory, the patch is no longer needed
use "${BUILD_DIR}" instead of "${WORKDIR}"/${P}_build
Cleanup as discussed
The restriction on a specific AUTOMAKE version is not necessary
Simplify
Bugfix: Reintroduce mpi support
Improve the ebuild a bit more

 - Get RDEPEND/DEPEND right
 - omit superfluous "${S}"
Patch the build system to use libtool properly
p4est configured with --enable-mpiio does indeed depend on virtual/mpi[romio]
Install the examples properly to usr/share/doc/${PF}/examples
Bugfix: Get the dependencies with mpi right. Add REQUIRED_USE constraints
Merge pull request #95 from tamiko/package-p4est

An ebuild for p4est [1]
Install the examples properly to usr/share/doc/${PF}/examples