A new bug can now be created using the supplied
template file. The template file needs to contain
all the required parameters needed by bugzilla.

Optional fields can also be supplied.

- Cleaned up exception handling code.
- Added comment on config parsing code.

Bugzilla fields are always lowercased, so a raw parser to retain the
case is not needed.

This adds support for custom parameters in bugzilla modify.
This needs to be given in form:
key1=val:key2=val:...