Fix serialization of exec files in the cache file
A git server should be bare to accept push requests
Fix the master tag name
Add some debug message in 'ogit push'
Rename MEMORY tests to MEM

It's shorter to type `./test.native test MEM 7` then
Add a (failing) test for remote operations

Need to run the Git dumb server on the other end.
Better error message in case 'ogit push` failed
Add more debug messages
Fix the closure computation of the graph of keys
Fix the generation of .dot files
Add an interface to Global_graph
More debug messages
Add more autogen files
The pack file contains inflated raw values

This seems to fix 'ogit push' \o/