69135888 ability to export CSV implementation
69135888 Excel export done with 'Contents' sheet
69135888 Excel export: added 'Tasks' and 'Comments' sheets
69135888 Excel exp: added 'Tasks' and 'Comments' for plan
69135888 Excel export: sql optimization
69135888 Excel export: sql optimization
Test env: added 'launchy' gem
69135888 Excel export: Rspec base coverage
69135888 Rspec: added checking rows
69135888 Rspec: checking rows - details
69135888 Excel export: Rspec tests
69135888 added 'Details' and 'Users' sheets
69135888 Excel export: Rspec tests
69135888 Excel export: Rspec - 'Users' sheet
69135888 Excel export: restrict access