nixos/logstash: add enableWeb option to enable kibana web interface
Fix broken checksums and update to version 4.2.018.
add nix-prefetch-zip
fix bzr prefetcher on darwin
st: 0.4.1 -> 0.5
i3: 4.7.2 -> 4.8
Fix sudo not installing due to timedir deprecation
keep fallback visudo editor as nano
numexpr: new package, version 2.4

Description from the numexpr project page [1]:
> Numexpr is a fast numerical expression evaluator for NumPy. With it,
> expressions that operate on arrays (like "3*a+4*b") are accelerated and use
> less memory than doing the same calculation in Python.

I am adding it, because it is a dependency of the pytables package.

[1]: https://github.com/pydata/numexpr
hdf5: Add zlib as optional dependency

This adds addition compression modes to the hdf5 library.

I am adding this, because pytables depends on it.
szip: Fix source hash

The hash code of the downloaded source tar-ball was not identical to the one
specified in the nix-expression. This commit fixes that problem.
hdf5: Add szip as an optional dependency

This adds additional compression modes to hdf5.

Note: The szip license may not be compatible with everyone's use case. Hence,
it is an optional dependency.
hdf5: Update to 1.8.13
tables: add new package, version 3.1.1

From the project page [1]:
> PyTables is a package for managing hierarchical datasets and designed to
> efficiently and easily cope with extremely large amounts of data.

It offers read/write access to hdf5 archives through a hierarchical interface.

I am adding it, because pandas depends on tables for hdf5 read/write
functionality.

Note: The name is a bit of an issue. The project is called pytables, whereas
the python module is simply called tables. I chose to name the nix-expression
tables for consistency with the source-tarball and the module name.

[1]: http://www.pytables.org/moin
pandas: Update to 0.14.0
4suite: mark as broken

None of the tools installed to bin/ work. They all throw an exception
similar to this:
  ImportError: No module named Ft.Xml.XPath._4xpath
accountsservice: be consistent in naming (always two 's')

The package is (correctly) named 'accountsservice' (with two 's'), but
the attribute and expression path lacked one 's'. Fix it.
accountsservice: add meta.description
alchemy: add meta.longDescription
antlr: add meta attributes