Adding FASTMath uber package and missing FASTMath packages (#4120)

* adding 0.5.1 and variant for uint8 bit stream word type

* Revisions as per davydden

* fixing style (flake8) issues

* - switched to derive from MakefilePackage
- fixed typo in variant check
- Confirmed installs correctly with bswtuint8 variant

* added build method; changed zfp_incdir to incdir

* * Adding uber fastmath package to support 'spack install fastmath'
* Adding dims variant boxlib to control compile-time spatial dimension count
* Explicitly disabling many parts of moab to get lib to build. Don't need tools yet.
* Add logic to spack/setup-env to not refer to $SYS_TYPE if its not defined.

* adding mesquite package

* * Added Chombo (still working on Fortran name mangling)
* Made mesquite depend on mpi
* Fixed use of boxlib's dims numerical variant

* adding PUMI

* flake8 compliance

* adding phasta

* fixing flake8 issues

* undue $SYS_TYPE protection change

* fixing install step for fastmath uber package; resolve issues requested by adamjstewart in PR

* revisions as per adamjstewart

* re-enabling trilinos and phasta dependencies

* all changes requested modulu values= and assert statement

* fixing cmake_args usage in pumi; fixing lib installs for chombo

* first pass at numerical variant

* fixing dims variant as per @adamjstewart

* fixing func/var name collision

* fixing means of disabling -Werror

* fix name collision for cmake_args var/func

* fixing chombo homepage/url; make FASTMath use chombo#3.2; remove extraneous comment about boxlib dim

* remove dummy fastmath package; switch to @BarrySmith soln for install of dummy bundle

* fix flake8 import os issue

* remove extraneous comment

* adding url for fastmath scidac site

* final fixes as per @adamjstewart

* adding 1 dims option for boxlib

* switching make(all) to gmake(all)

var/spack/repos/builtin/packages/boxlib/package.py

@@ -36,12 +36,19 @@ class Boxlib(CMakePackage):
 
     depends_on('mpi')
 
+    variant('dims',
+        default='3',
+        values=('1', '2', '3'),
+        multi=False,
+        description='Number of spatial dimensions'
+    )
+
     def cmake_args(self):
         spec = self.spec
         options = []
 
         options.extend([
-            # '-DBL_SPACEDIM=3',
+            '-DBL_SPACEDIM=%d' % int(spec.variants['dims'].value),
             '-DENABLE_POSITION_INDEPENDENT_CODE=ON',
             '-DENABLE_FBASELIB=ON',
             '-DCMAKE_C_COMPILER=%s' % spec['mpi'].mpicc,