[CLEANUP] cleanup the TCA
- remove not used (and obsolete) TCA-config 'dividers2tabs'
- remove needless call of 'ExtensionManagementUtility::extRelPath('location_storage')' in TCA-config 'iconfile'
[FEATURE] CD-45970: move TCA-configuration from ext_tables.php to Configuration/TCA/[tablename].php
This is highly encouraged since TYPO3 CMS 6.2 already for performance reasons.