[MERGE] Give full control over plugins to bzrlib clients

[Aaron Bentley]

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Hi all,

This patch gives bzrlib clients the control they need over which plugins
are loaded.

The plugin path is no longer set when bzrlib is imported.  Clients that
want a plugin path set should call set_plugins_path.

load_plugins now allows clients to specify exactly which path should be
used.  This allows clients to avoid importing plugins from system plugin
location.

disable_plugins now prevents plugins from being directly imported, even
if they are bundled with Bazaar.  It is implemented in terms of
load_plugins.

Finally, I've removed Vincent's colordiff change, since it is no longer
needed to make "bzr selftest --no-plugins" work correctly.

There are no tests, because plugin machinery is hard to test.

Aaron
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