Added lseek64 syscall and used file flags properly

Preload lib: RPC/IPC Mercury/Margo environments are only initialized if the mountdir path is used by the application
For that, the daemon writes the mountdir (it was started with) to a configurable path to disk.
The libraries read this value and only the process that uses part of this path will actually trigger the environment initialization.
This forbids prior behavior where applications initialize the whole environment numerous times, although unused.
For example, any MPI program will spawn multiple processes, all with the LD_PRELOAD environment variable set.

- 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"