constraints.

Changes VERSION to VERSION_CMD to avoid name clash with EOS VERSION
macro.

if castor.json option is true in the config file.

File IDs were being converted from string to int using strtoul instead
of strtoull

cancellation tests + modified client_helper.sh so that multiple word
arguments work as expected for admin_cta

Adapted the cta-admin commands so that we can set the --reason and the
--comment