Hi,

As we can not very easily decide if we are inside a test execution or not there was the idea to have special #halt messages 

https://pharo.fogbugz.com/f/cases/20151/new-halt-messages

This PR implements them:

https://github.com/pharo-project/pharo/pull/1177

There is now #haltIfInsideTest and #haltfOutsideTest. In addition, the PR adds a helper method to make checking if the current
execution environment is a test run a bit easier:  "CurrentExecutionEnvironment value isTest���.

Marcus