Restoring deleted files implies restoring them in the eos namespace and
in the cta catalogue. The command has no atomicity guarantees, a file
may be restored in the eos namespace but the restoring in the cta
catalogue may fail.

This reverts commit 20c4f60a.

Adapted SchemaChecker to be compatible with cta-statistics database

Revert "Top CMakeLists.txt now explicitly lists all the REQUIRED components to be found by cmake/Findoracle-instantclient.cmake"

This reverts commit 0ee95f93.

Top CMakeLists.txt now explicitly lists all the REQUIRED components to be found by cmake/Findoracle-instantclient.cmake

containing: eos-import-dirs

Commenting this out from master due to broken dependency in CI

- CASTOR migration tools stay under CTA/migration
- upgrade tools are now under CTA/upgrade_db
- adds FindGRPC.cmake (required for migration tools)
- updates submodule to v0.50 (required for EOS gRPC API)

Moved disk-operations-related code into the new "disk" directory

Added the manually specified cmake variable named NoAcs.  Please note that this variable currently has no effect when building the CTA rpms