* Add --version arg to spack python command
* Add `spack debug report` command

1137b183 removed the -s option from spack such that to see a stack
trace you must pass the --stacktrace option. The bug report templates
were not updated accordingly.

The original numbering was not incorrect markdown but this is easier to read.

This replaces the single github issue-reporting template with templates for the
following types of issues:

* Build issues
* Spack command errors
* Feature request

Each template includes suggestions which are generally useful for the type of
issue encountered.