New features implemented in the alien plugin:

New features implemented in the alien plugin:
- Enable xrootd tweaks to reduce file access timeouts (both in the submitted jobs or in local merging phase). May cause unnecessary file skipping !!!:
   plugin->SetFastReadOption();
- Enable merging via a special JDL. Files for merging (JDL, merge macro, executable and validation script) are generated and copied in alien space. Merging jobs are submitted only in "terminate" mode of the plugin:
   plugin->SetMergeViaJDL();
- Force overwriting existing collections:
   plugin->SetOverwriteMode();