Start the migration process from entropy to btrplace:solver-api
forgot test files
Split VM templates and node templates

In addition, remove some useless files and add new tests
Attach element attributes to script to re-use solver-api.
Other constraints of solver-api except SequentialVMTransitions
code cleaning + documentation.
Documentation
A tryout to specify discrete restriction using the  '>>' operator before the constraint. Constraints will be continuous by default when possible.
Test the '>>' operator on the constraints
Documentation
test fix
Support for SequentialVMTransitions
- JSON Export for the scripts
- Template is now just an element attribute.
start to update documentation
Better error reporting with ranges
Improve error reporting in range again.

It is still not perfect due to the inclusion of artificial token that don't know the line/char position
Another approach to maintain line/column identifier for error in ranges
Finer error messages when instantiation fail
clean
bump to release