Upgrade patchelf
Make 'hit' tool available from Bash in hashstack scripts
Relocateable packages
added pure python memory profiling package
Prepend PKG_CONFIG_PATH in when_build_dependency.

This helps avoiding accidents where we accidentally use
a system package despite specifying a local package.
Add Piranha package
Depend on m4, bison needs m4 to build
Update Arb to 2.1.0

I am using the git commit taken from the 2.1.0 tag:

https://github.com/fredrik-johansson/arb/releases/tag/2.1.0
Update Flint to 2.4.4

This uses the official tarball. Previously we had to use Fredrik's personal
copy, as that was the only one compatible with Arb. Now the official Flint is
compatible as well, so we should use it from now on.
Merge pull request #324 from hashdist/arb

Update Arb and Flint
Apply patch to libiconv only on linux where modern versions of glibc causes build issues
Revert "Sphinx should be a distutils package"

Fixes #327.

This reverts commit 9bf384a00c14976498745939d4065d9b291b871d.
Merge pull request #326 from jcftang/wip-apply-libiconv-only-on-linux

Apply patch to libiconv only on linux where modern versions of glibc cau...
Tweak openssl package to deal with not being 64bit on OSX
Merge pull request #328 from hashdist/sphinx

Revert "Sphinx should be a distutils package"
Merge pull request #330 from jcftang/wip-osx-openssl-tweaks

Tweak openssl package to deal with not being 64bit on OSX
Add the CSymPy package
CSymPy: Use out of tree build

It used to be that the Python wrappers could only be installed using the in
tree build, but now it works out of tree as well, so we use it.
Merge pull request #323 from jcftang/bison-depends-on-m4

Depend on m4, bison needs m4 to build
Update ansible to 1.6.5 stable