Bugfixing: sometimes the wrong tab was being chosen
1) Remove the Dart-specific notion of "VM running in checked mode"
2) Do not pollute the launch configuration with the last time it ran, as
this is annoying when the launch config is kept in e.g. git
1) Rename of some local vars to no longer contain the "dart" word
2) TODOs regarding a commented out code
Merge pull request #28 from ivmarkov/master

Potential fix for #10 & other small improvements