Fix Multiple tests

[rpgoldman]

1. Fixed tests that failed when unable to find the pycdop executable script. Previously, these tests assumed that the shell PATH would be properly set up to find the pydcop and dcop_cli.py scripts. This patch sticks a PATH initialization form into the invocations. This is a somewhat kludgy way to properly initialize the subprocesses used by the tests.
2. Another kludge is applied to avoid the tests operating on an in-process algorithm. This is unfortunate, but necessary because the test looped over all the available algorithms instead of using an enumerated set.
3. Fixed a test that was failing because it was too aggressive with a timeout parameter.