BUG: continuation of updateMethods with empty activeDesignVariables (#1540)

When activeDesignVariables are not set explicitly, all design variables are treated as active. These were allocated properly when starting from 0 but not when starting from an intermediate optimisation cycle (e.g. running 5 optimisation cycles, stopping and restarting).

TUT: added a new tutorial including the restart of an optimisation run to help identify future regression

added bug label

added 6 commits

• 42ac9736...60efde8c - 5 commits from branch master
• 254d38d7 - BUG: continuation of updateMethods with empty activeDesignVariables

Compare with previous version

merged

mentioned in commit 0bbf94fb

mentioned in issue #1540 (closed)