Xrootd support

Add support for reading xrootd files.

Added new package to hold the fRead libraries that must be dynamically loaded to support reading different file types. Reading xrootd files has been tested. Reading Davix files has not.

Event/FaserEventPlugins/CMakeLists.txt

+################################################################################
+# Package: FaserEventsPlugins
+################################################################################
+
+# Declare the package name:
+atlas_subdir( FaserEventsPlugins )
+
+# External dependencies:
+find_package( tdaq-common COMPONENTS ers EventStorage )
+find_package( Boost COMPONENTS system )
+find_package( Xrootd COMPONENTS Posix PosixPreload )
+find_package( Davix )
+
+# Make sure that libraries are linked correctly:
+atlas_disable_as_needed()
+
+atlas_add_library( fReadXRootD
+   src/fReadXRootD.h src/fReadXRootD.cxx
+   NO_PUBLIC_HEADERS
+   PRIVATE_INCLUDE_DIRS FaserEventStorage ${TDAQ-COMMON_INCLUDE_DIRS} 
+   ${XROOTD_INCLUDE_DIRS} ${Boost_INCLUDE_DIRS}
+   PRIVATE_LINK_LIBRARIES FaserEventStorageLib ${TDAQ-COMMON_LIBRARIES} 
+   ${XROOTD_LIBRARIES} ${Boost_LIBRARIES}
+   PRIVATE_DEFINITIONS -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
+   -D_FILE_OFFSET_BITS=64 )
+
+atlas_add_library( fReadPlain 
+   src/fReadPlain.h src/fReadPlain.cxx 
+   NO_PUBLIC_HEADERS
+   PRIVATE_INCLUDE_DIRS FaserEventStorage ${TDAQ-COMMON_INCLUDE_DIRS} 
+   ${Boost_INCLUDE_DIRS}
+   PRIVATE_LINK_LIBRARIES FaserEventStorageLib ${TDAQ-COMMON_LIBRARIES} 
+   ${Boost_LIBRARIES})
+
+atlas_add_library( fReadDavix
+   src/fReadDavix.h src/fReadDavix.cxx
+   NO_PUBLIC_HEADERS
+   PRIVATE_INCLUDE_DIRS FaserEventStorage ${TDAQ-COMMON_INCLUDE_DIRS}
+   ${DAVIX_INCLUDE_DIRS} ${Boost_INCLUDE_DIRS}
+   PRIVATE_LINK_LIBRARIES FaserEventStorageLib ${TDAQ-COMMON_LIBRARIES} 
+   ${DAVIX_LIBRARIES} ${Boost_LIBRARIES} )
+
+