HPCC-8715 - Compress graphs and handle graphs/results more efficiently.

+ Serialize graphs a binary blobs (which will be compressed by ptree)
+ Provide a daliadmin cmdline tool to compress existing workunit
graphs
+ Improve access efficiency, by avoiding access to xgmml until
absolutely necessary
+ Remove @fetchEntire automatical retreival of entire branch for
results/variables, which caused everything to be fetch when loaded.
The actual result/meta is explicitly fetched as necessary already.

Signed-off-by: Jake Smith <jake.smith@lexisnexis.com>