Respect european.cal in DatedSection week logic

[tsautier]

Problem

SectionManager creates new week directories on Sundays instead of Mondays, even when european.cal=true is set in the configuration. The European calendar setting was being ignored.

Solution

Fix the week directory creation logic in DatedSection to respect the European calendar setting.

Changes Made

• Modified DatedSection.java to properly check the european.cal configuration
• Week directories are now created on Monday when European calendar is enabled

Fixes: #325

[tsautier]

@mvangoor @hrxcodes for review