Fix for #177

gcc : changed objdir to something out of srcdir and added '--with-sysroot=/'
binutils : added '--with-sysroot=/'

Update gmp to 6.1.0

Update mpc to 1.0.3

Update CleverLeaf package to use Boost and fix SAMRAI MPI usage

Fix issue with gcc 5.x not building on RHEL6

Boost: mpi, python and compression for iostream variants

Had to force a patch to the OMPT support, so the hash for v0.1 has changed.

changed.

Flux package reworked to include all new dependencies, fixed issues with a
clean-build of hwloc, lua and czmq as well that prevented flux from building
cold on a minimal system.

- _cross_provider_maps() had suffered some bit rot (map returned was
  ill-formed but still worked for cases with one vdep)

- ProviderIndex.satisfies() was only checking whether the result map
  was non-empty.  It should check whether all common vdeps are *in*
  the result map, as that indicates there is *some* way to satisfy
  *all* of them.  We were checking whether there was some way to
  satisfy *any one* of them, which is wrong.

- Above would cause a problem when there is more than one vdep provider.

- Added test that covers this case.

- Added `constrained()` method to Spec. Analogous to `normalized()`:
  `constrain():constrained() :: normalize():normalized()`

Fixed Mitos dependency and added new version

Revert "WIP: openssl: set KERNEL_BITS to make ./config work"

- Can't think of a better way to do this.
- The externals integration will cause spack to die in weird ways for
  users who just pull from develop.

cleaning up commits for merge request