* language: compile everything in the source directory
This removes the need to specify a 'main'. Instead we 'source' in
daml.yaml should point to the source root directory.
* language: feature: initial implementation of a 'migrate' command
We add a 'migrate' command to daml assistant that generates a project
that allows to migrate contract instances from package1 to package2.
This first version reads both package1 and package2 from source. As a
next step we read only the dalfs from package1, because it might have
been created with a different compiler.
* Add quickstart-scala template to DAML Assistant , #614
Removing the rule to create a quickstart-scala.tar.gz, it is not needed
* Return non-zero error code if failures detected, #614
* Reading project name from `daml.yaml`, #614
Removing Versions.scala.template
