NEW: SSHOSGComputingElement and condorgce script

To submit to OSG, a variation of the condor client must be provided. In
particular, it requires the "grid" Universe, and the "grid_resource"
parameter. The condor_q is also different: the user is not needed as the
submitter is the submission host (apparently, from the doc), but adding
a -globus command line option allows for grid job monitoring.

This is untested as ILCDIRAC does not have an OSG client installed
(would be nice though).
Change author
CHANGE: inherited meta data is not used when doing a find

CHANGE: getDirectoryMetadata: extract the query that, given a meta name
and pathIDs string, return the values and DirIDs. This is a private
method __getDirMeta.

CHANGE: findDirIDsByMetadata: 
1) use the getPathIDs method to get the current path and its parents
IDs.
2) for the meta dict expanded, use the __getDirMeta method to get the
parents' meta values. If they are there, then delete from the input meta
dict the key as it should not be used for the subsequent query. This
part can also be used to identify conflicting meta data with a clear
message (not done here).
3) use the stripped dict for the DirID query, logic remains untouched. 

This allows queries where one of the parent meta data is used. Until
now, this would result in an empty list (not logical).
FIX: do not return if the meta is not set for the dir nor its parents.

Simply continue to the next meta data.
Removed few deprecated calls
Added LICENSE file + disclaimer in all scripts with --license switch
quiet display option in do_find()
Removed broken test
Removed a couple of dangerous methods
fix: client should not return a de-serialized object
FIX: Take the latest DT that fits
Few bugs fixed
Less obscure coding (Krzys, you're driving me crazy with all this
functor!)
Removed dangerous function
Added "Assigned" job status
query -> update
Merge pull request #1653 from sposs/FCFindFix

[v6r9] CHANGE: inherited meta data is not used when doing a find
v6r9p19
Some beautification
FIX: DirectoryMetadata - take into account metadata of parent
directories when limiting the file by metadata query by a given path