Improve formatting of logged errors

A recent change tried to improve the display of logged errors by adding line wrapping and indentation - resulting in display like the following:
```
*** Errors logged with setup "setup_httpcommand_test":
test_restful_get: code returned numeric scalar = 0 when DTest expected an empty charvec to indicate success
test_get_url: code returned numeric scalar = 0 when DTest expected an empty charvec to indicate success
test_chunked: code returned character value = "
[rc: 11 | msg: DOMAIN ERROR occurred during response payload conversion (Data was not converted) | HTTP Status: 200 "OK" | ≢Data: 33653]"
when DTest expected an empty charvec to indicate success
test_BaseURL: code returned character value = "
Unexpected result when URL and BaseURL are specified"
when DTest expected an empty charvec to indicate success
test_deflate: code returned character value = " VALUE ERROR Undefined name: result "
when DTest expected an empty charvec to indicate success
test_timeout: code returned character value = "Timeout test failed"
when DTest expected an empty charvec to indicate success
```

Previously the display (see below) had one line per error which I think is easier to interpret, even if the line extends beyond the screen width.
```
*** Errors logged with setup "setup_httpcommand_test":
test_timeout: code returned character value = "Timeout test failed" when DTest expected an empty charvec to indicate success
test_get_url: code returned numeric scalar = 0 when DTest expected an empty charvec to indicate success
test_restful_get: code returned numeric scalar = 0 when DTest expected an empty charvec to indicate success
test_chunked: code returned character value = "[rc: 11 | msg: DOMAIN ERROR occurred during response payload conversion (Data was not converted) | HTTP Status: 200 "OK" | ≢Data: 33653]" when DTest expected an empty charvec to indicate success
test_deflate: code returned character value = " VALUE ERROR Undefined name: result " when DTest expected an empty charvec to indicate success
test_BaseURL: code returned character value = "Unexpected result when URL and BaseURL are specified" when DTest expected an empty charvec to indicate success
```
To address this issue we should look at both the formatting and content of the error messages.