Use ::dlf_isinitialized instead of our own version so that it works also when DLF is initialized from C

in disk2diskCopyDone,  use the id of the source diskCopy instead of its state. This fixes bug #28336 where a migration took place concurrently to replication and the status of the diskcopies were inconsistent at the end

Added message range for the ORACLE library and defined a VERBOSE error level for which messages are just ignored.

Improved handling of prepareForMigration when file was deleted during transfer. Do not report any failure but log the fact that we recognized the situation and acted accordingly

Improved logging into DLF. You can now declare new messages even before DLF was initialized. Very useful for libraries loaded before the main is called \!

to "tape not mounted or not ready").

Fixed 64bit stager segmentation fault. In c++ NULL is an integral constant, while in C it is a defined pointer constant. As a result NULL in va_arg lists must be type cast to const char * especially on 64 bit platforms otherwise the behaviour is undefined. - Refer to http://lwn.net/Articles/93574/ for a nice article on NULL vs 0

Created a Disk only test suite and included it in the framework. At the time, this tests only the forcing of fileclasses and needs 2 new extra parameters to be set in the config file : DISKONLY_SVCCLASS and FORCED_FILECLASS