Batcave

- Changed
- Fixed crash when the command is not in the driver.
- Fixed problem in fileutil.Expander.expand_directory() where it did not popd().

- Changed
- Improve expansion condition evaluation when the condition contains a variable.
- Cleanup expression condition exception handling.
- Fix issue with Perforce integration.
- Rename iispy member function to be consistent.

- Changed
- Fixed issues with XML parsing.
- Upgrade setuptools to 34.3.0.

- Changed
- Fixed bad imports.
- Fixed bad return in str_to_pythonval.
- Change xml parser to standard in xml module.
- Rename constant in data module to uppercase.
- Fix issue in data module when returning columns in XML table.
- Upgrade PyQt5 to 5.8.
- Upgrade setuptools to 34.2.0.

- Changed
- Improved Cmd error handling.
- Fixed import issue.

- Added
- Created fileutil module from file-related init functions.

- Changed
- Moved system-related init functions to sysutil.
- Convert expander to a class.
- Don't raise custom exceptions inside standard ones.
- Fix typo in str_to_pythonval().
- Cleanup fileutil.spew().

- Removed
- Move procedure module to BatCave.