Fixed bad checkForReconnection in teh transfermanagerd. We were checking far too often due to misindentation and python taking identation into account

Made some factorization in the tape code + added a time to know how long it took to do the different tape operations

This commit only modifies the interface of TapeserverProxy.  The actual
number of files on tape is currently not returned.  The temporary value of
0 is returned instead.