Sqlcmd

- Removed setup.py dependency on ez_setup.
- Changed to refer to 'grizzled-python', instead of 'grizzled'

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- Pressing interrupt (Ctrl-C) now cancels whatever command is being
entered.
- Moved various classes in __init__.py into separate modules, for ease
of maintenance.
- Fixed syntax checks on .var command.
- ".show tables" on Oracle will now show non-system tables that belong to
all users, not just the user who's logged in.
- ".show tables" now accepts a third regular expression filter parameter,
allowing list of returned tables to be restricted to those matching
the regular expression.

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- Added 'colspacing' setting, allowing control over the column spacing in
result set output.
- Initial values for settings (i.e., arguments to ".set") can be specified
in a [settings] section in the configuration file.
- Fixed some bugs in the handling of shell-style variables.

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- Added ".about" metacommand.
- Added ".show database" metacommand, to get information about the current
database and RDBMS software.
- Fixed a small bug with the ConfigurationError exception class, improving
error messages.
- Better formatting of help output.
- Slightly better error handling.

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- Now pre-reqs Grizzled version 0.8.4 or better, to provide decent Oracle
support. Tested against Oracle XE 10.2 for Linux.

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- Unknown "." commands are no longer passed through to the database engine
by default, resulting in better error messages.
- The "help variables" topic is now "help settings".

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