[RT] Misc Fixes (getredash#118)

- Don't halt fixing qrds refs if a bad ref is found
- Fix: the check for an app.redash.io ORIGIN was incorrect

[RT-107] Show full traceback when an exception is raised (getredash#108)

Add a command to convert app.redash.io csvurl queries to OSS Redash c…

…sv (getredash#100)

Bump version to .6 and fix bad TOML syntax. (getredash#70)

[RT-5] Add migration script to examples (getredash#23)

* Update client.py with methods for migration script
* Add migration script and docs to /examples

Co-authored-by: bmtKIA6 <[email protected]>
Co-authored-by: Valentine Mourzenok <[email protected]>