Changing references to mpirun to mpiexec in docs.

Removing unneeded log.msg in ipcluster.py

Adding support for mpiexec as well as mpirun. The mpiexec command is the preferred way of starting MPI jobs. We also support mpirun for backwards compatiblity.

Adding documentation to the new benchmark method of MultiEngineClient.

Merge my main trunk work. Lots of testing and documentation work. See the individual log messages for details, this is a branch that added a lot of tests, as well as improving the testing system quite a bit so it is more robust and identifies many more tests. Various API cleanups, bug fixes and improvements went in as well.

Add a .bzrignore file for cleaner 'bzr status' output

Add information about our testing system, test writing tips, etc.

Update copyright/author statements. - Updated copyright statements to use the new form: # Copyright (C) 2008-2009 The IPython Development Team I left the old notices in place (just updating the year in some cases), because as far as I know, old copyright statements are not meant to be retroactively modified. - Also, on most files, replaced __author__ marks with an 'Authors' section in the module docstring. This reduces top-level code in the module, while ensuring that the Author(s) get properly acknowledged in auto-generated API docs (sphinx doesn't read __author__ marks, but it will include the module docstring). I only left a few in place for very old files that we ship externally, and for those by Laurent: he had his authorship mark both in the docstring and in __author__ variables, so I think out of courtesy it would be better to ask him about it on the list. All the others were I found regular __author__ variables, I moved them to the main docstring.

Merging from upstream trunk

Merging Robert Kern's pretty-printing branch.