Standardize and clarify plugin arguments

Current arguments:

pifr_drupal:
  'core' => 7,
  'database' => 'mysql-5.0-isam',
  'modules' => array(),
  'core-url' => '',

pifr_coder:
  'modules' => array(),
  'directory' => '',
  'pifr_coder.annotate' => FALSE,

pifr_simpletest:
  'core' => 7,
  'tests' => array(),
  'modules' => array(),
  'directory' => '',
  'clone-db' => '',

other:
  'test.title' => '',

Obviously latter two override pifr_drupal base...and database arugment needs to be removed.

Lets shoot for something like:

'test.title' => NULL,
'test.directory.review' => '',
'test.directory.apply' => '',
'test.directory.dependency' => '',
'test.files' => array(),
'test.extensions' => array(),

'drupal.core.version' => 7,
'drupal.core.url' => ':pserver:anonymous:anonymous@cvs.drupal.org:/cvs/drupal/drupal',
'drupal.modules' => array(),
'drupal.user' => 'admin',
'drupal.pass' => NULL,

'coder.annotate' => FALSE,

'simpletest.tests' => array(),
'simpletest.db' => NULL,

EDIT: Updated several times.

This patch should do it, but I'm looking into more generic implementations of test.* in client.inc instead of drupal/coder/simpletest clients.

Shift code around to fit new argument design, added some new useful arguments, replaced some class variables with arguments, updated debug test arrays, added update path, and fixed a few two bugs in code related to these arguments.

Updated the client plugin tests, which do not run on but...thus no fail until I ran them locally.

Another test fix.

Final tweaks to test.

Committed.