Geoff Lawler authored Mar 17, 2020 and Ryan Goodfellow committed Mar 17, 2020

When passing errors back through the API, append the wrapped error
message in the errror detail. More detail is better.

Example:
```
glawler@river:~/integrated$ mergetb compile next.py
Status Code: 400
Error: Uncategorized Error
Detail: reticulation error
Timestamp: 2020-03-17 18:38:44.796497288 +0000 UTC m=+122.662407102
Type: https://mergetb.org/errors/uncategorized-error
glawler@river:~/integrated$ mergetb compile next.py
Status Code: 400
Error: Uncategorized Error
Detail: reticulation error: Error adding static routes to the model: No addresses on endpoint a0.0
Timestamp: 2020-03-17 18:43:51.966373516 +0000 UTC m=+201.032820535
Type: https://mergetb.org/errors/uncategorized-error
glawler@river:~/integrated$
```