Fix test release script.

Last night's run of testRelease failed with the error message:

```
Unmatched ".
Error running testReleaseHelp script: 1
```

Update the testReleaseHelper script to escape quotes and variables in a way that supports older
versions of tcsh, like the one used by the automated test system. As a bonus, fix the `--version`
output when CHPL_DEVELOPER is not set. (I forgot to update the default value in version.cpp
in #550 to be "0" instead of empty string.)