minimalkb 2.2.0
- change find() API to make it more consistent
- whatever the number of variables, always returns a list of dict with the
variables as key
- the param 'vars' is now optional.
- if no variable is passed, search for all variables by default
- anonymous variables (starting by `__`) are now named var1, var2,... in
the results
- removed unused `minimalkb/services` sub-package