Fix problems with first period commutation on artisan 1.

Add financials spreadsheet tests for artisan 2.
PMO-2426: global default parameters adjusted
PMO-2427: relabeling output paths
PMO-2435: available occurrence distributions restricted and parm new labeled
PMO-2353: validators and value conversion functions adjusted to avoid application crashes
CRMV-2338: further step trying to use a custom.css
releasing new plugin version 0.6.25-kti
only _ref.tsl should be part of the code repository
PMO-2458: updating excel-import plugin and removing noisy println statements
release new plugin version 0.7.1