Added: register daemon to system for storing auxiliary files + better daemon startup and shutdown handling

- should permissions be checked when access() is called or discarded. Default off
//#define CHECK_ACCESS
- If access permissions should be checked while opening a file. Default off
//#define CHECK_ACCESS_DURING_OPEN
- If disabled, a file or directory is always presumed to be there (even if it is not). No check is executed. Default on.
#define DO_LOOKUP

- Add: adafs_access, open with check if object exists
- Add: root metadentry to database of each node
- Modified: Open, unlink, mkdir, rmdir and combined their functionality to "create node" and "remove node"

Modified fs code to circumvent Mercury bug with Eager mode.
Migrated to proper use of margo_bulk_access and use it for memory allocation.