Do not use a -s option to specify share URIs; share URIs are
mandatory and should be specified instead as positional arguments.
We no longer care about memory allocation failures.
Add a new -l, --list-supports option to the gfsec-split program,
to print a list of all currently connected and available supports.
The standard RNG must be initialized, otherwise shares will
always be assigned the same numbers.
Add the gfsec-split program to split a secret into shares,
dispatch the shares to specific locations, and write a
configuration file allowing to reconstitute the secret using
the gfsec-use program.