* mumps: Add support for Intel compiler and insure both lapack and blas libraries are passed to the examples

Likely it was not discoverged before that the examples require both lapack and blas libraries because it
was tested with Openblas which is one large library containing everything.
Funded-by: IDEAS
Project: IDEAS/xSDK
Time: .3 hours

* flake8 fix.

* Created the initial version of the 'OpenSceneGraph' package.

* Added 'zlib' as a dependency and linked it during the build step.

* Fixed a few minor PEP8 style violations in the 'OpenSceneGraph' package.

* Added cmake as a build dependency and improved the build procedure.

* Made a few important argument updates to improve package compatibility.

* Fixed up a few remaining style issues in the 'openscenegraph' package.

* Added a description for the 'openscenegraph' package.

* Fixed a bug that was causing some 'openscenegraph@3.2.3%gcc' installs to fail.

* Fixed a number of small issues with the 'openscenegraph' package.

* Removed a number of superfluous flags from the 'openscenegraph' install.

The texlive tarball, install-tl-unx.tar.gz is unversioned and changes
periodically.  When it does, the digest needs to change too.  This does
that.

* Don't clear LD_LIBRARY_PATH and friends from compiler wrappers

* remove debugging print

* Added the '+webkit' variant to the 'qt' package.

* Made 'qmake' an available executable to 'qt' depdendents.

Bug concretize external virtuals

* Add new version property to handle joined version numbers

* Add unit test for new joined property

* Add documentation on version.up_to() and version.joined

* patch directive : fixed retrieval from urls fixes #1584

 - add support for 'gz' archives
 - fixed bugs with URL patches
 - updated nwchem

* patch directive : added checksum to UrlPatch

 - refactored classes in patch.py
 - updated nwchem

* patch directive : added caching

* Fixes needed to build gcc on Linux/ppc64le

* flake8 fix.

Things that accessed the cdd package, such as `spack info cdd run
tripped over a buglet in the *cdd* package, causing them to exit with
something like this:

```
Caused by:
TypeError: 'str' object is not callable
  File "/rss/spack/lib/spack/spack/repository.py", line 584, in get
    self._instances[key] = package_class(copy)
  File "/rss/spack/lib/spack/spack/package.py", line 398, in __init__
    f = fs.for_package_version(self, self.version)
  File "/rss/spack/lib/spack/spack/fetch_strategy.py", line 852, in for_package_version
    attrs['url'] = pkg.url_for_version(version)
  File "/rss/spack/var/spack/repos/builtin/packages/cdd/package.py", line 40, in url_for_version
    str(version.dotted()).replace('.', ''))
```

@tgamblin pointed out that `dotted` is a property, not a functin call
and that the parentheses are therefor inappropriate.

This deletes the parentheses.  `spack info cdd` now works for me.

Add package for htop, an interactive text-mode process viewer for
Unix systems.  Think top, with pretty colors and dyanmic bar graphs.

More info [here](https://github.com/hishamhm/htop).

If Spec.dag_hash was called for the first time with a 'length'
specified, the cached hash was truncated. This ensures that the
full hash is cached.

* Removes the extra argument from Package.do_install while maintaining the changes in behavior pulled in #1603

* install : removed -i and -d shorthands (breaks backward compatibility)

* Change ':' to ','

* petsc: require boost for :3.5 only

* petsc: turn off download for c2html and hwloc

* Add package bazel

* Add support for bazel-based builds

* Update the krell institute products to use the latest features of spack for building on cluster platforms.

* Address travis error messages and resubmit the pull request.

* Update the contents of openspeedshop package.py so it passes the flake8 tests.

* Fix flake8 error-whitespack issue in mrnet package.py file.

* Add updates based on spack reviewer feedback.

* More fixes based on comments from reviewers.  Switch using extend to using append, remove additional setting of PATH and LD_LIBRARY_PATH that should not be required due to RPATH.

* More review related changes.  Update MPIOption.append lines and take out xercesc references.

* Create a base options function for common openspeedshop base cmake options to reduce redundencies.

* fix download url for paraver

* added note to remove older version

* Ignore GPG/PGP signatures/checksums when finding available downloads

* Remove duplicated basename

* Add platform-specific configuration scopes.

* Update `spack config` to use the new scope arguments.

* travis : unit tests will run with and without libyaml

* travis : fixed package that are installed

* Workaround for illegal package merging in py-matplotlib/py-basemap

# Conflicts:
#	var/spack/repos/builtin/packages/py-basemap/package.py

* flake8

* flake8

* Be conservative: only apply the namespace package fix for Python >= 3.5.2

* flake8

* Bug fix

* py-macs2: New package

* py-macs2: add py-numpy@1.6: dependency

* Major updates to Contribution Guide

* Grammar changes

* Fix missing/extra backticks

* Rewording, links, and tips added

* petsc: add 3.7.4

* slepc: add 3.7.3