[fix] check first for deprecated layout template
[fix] correct check for deprecated container/column template
[fix] correct method to calculate time difference
[merge] from develop + correct conflicts
[fix] test title and summary before position test
[fix] allow PEAR include directly without subfolder to prevent problems with other installed PEAR class
[mod] include user folder before core folder that user can overwrite core services
[fix] correct template check for site layout before triggering error
Merge branch 'development' into core/services
[fix] create variable for absolute date string