Grizzled-python

* `grizzled.db` now uses SQLite3 PRAGMAs to get table metadata and index
metadata.

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* Added `grizzled.log` module (including a `WrappingLogFormatter` class)
which contains some classes and functions for use with the standard
logging module.
* Added `grizzled.misc.str2bool()` function.

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* Added `grizzled.history`.
* Converted some lingering Epytext markup to reStructuredText.

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* Added `grizzled.misc` module and `ReadOnly` class.
* Added the `spawnd()` function the `grizzled.os` module.
* Enhanced `grizzled.db SQLite3` driver to return better index and table
metadata.

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* Deprecated `grizzled.os.file_separator()`. Silly me, there's a standard
`os.path.sep` variable.
* In `grizzled.db`, the MySQL index metadata function wasn't detecting column
uniqueness properly.
* In `grizzled.db`, the PostgreSQL table metadata function wasn't detecting
NULL/NOT NULL properly.
* Added `find_command()` and `path_elements()` functions to `grizzled.os`.
* Documentation format changed from default Epydoc to reStructuredText.
* Fixed bug in `grizzled.db.add_driver()` function that prevented a driver
from being added programmatically.
* Added `class_for_name()` function to `grizzled.system` module.
* `grizzled.config` now uses `grizzled.collections.OrderedDict`
* In `grizzled.config`, `Configuration.sections()` is now a property.

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* Removed deprecated methods.
* Removed deprecated `optparse` module.
* Added MySQL-specific logic for table metadata to `grizzled.db`
* Added PostgreSQL-specific logic for table metadata to `grizzled.db`
* Added ability to retrieve list of database tables to `grizzled.db`.
* Added `grizzled.io.filelock.locked_file()` function, for use with the
`with` statement.

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