Fixed bug #104601: RFE : modify/enterSvcClass should check consistency of the GCPolicies when DiskPools are shared

Conflicts:
	hsmtools/entersvcclass
	hsmtools/modifysvcclass

Fixed long options of listtranfers taking an argument. They were broken in their long version as getopt was not aware of the argument

Fixed in the master ready for a 2.1.15.x release.

Downgraded log from ERROR to WARNING when VMGR returns ENOSPC. Agreed with Steve as at CERN the refill logic runs every 20 minutes, while we loop every 10 seconds to get a tape to write to, thus we may (and do) have tens of logs stating there's no space before getting a tape.

Basically we apply now the rule "non-user jobs don't timeout" to all
non-user d2d jobs, that is sources and destinations, given that also
sources may stay pending for long in the queue because of the backfill
mechanism.

Improved selection of candidates for a draining job: some d2d jobs were not created if independent (and not relevant) d2d jobs existed already

database deadlock

Fixed bug #105006: Draining disk 2 disk copies are not always repecting the GuaranteedUserSlotsPercentage

Fixed bug #104998: Synchronization of d2d srcs too aggressive and creating issues for draining cancelation

Fixed case where a gridFTP client sends overlapping chunks. We now raise an error instead of screwing the checksum

Fixed bug #104856: RFE: make the timeout to expire old requests different for failed vs. successful ones

The previous commit was a bit fast, this is now the correct refactoring without goto. Moreover, now we expose timeout errors as SETIMEDOUT, instead of overwriting serrno with a generic SEINTERNAL.

Removed infinite loop around stage_open(), introduced long ago (2005) to compensate for network errors. We now prefer to expose network errors and timeouts and give users the option to retry. At the same time, minor refactoring of that code that dropped a label and extended the error handling to the rfio_open() calls.