Daemon is now capable of providing version information through the
`--version` cli option.

variables and paths have been updated to the new project name
ADAFS -> GKFS

Get rid of all the occurrences of old project name "adafs" from output
strings and documentation

ADAFS_CWD -> GKFS_CWD

From now on the changelog will adhere to the https://keepachangelog.com/en/1.0.0/ format

get rid of old adafs name from pid file

ADAFS_DEPS_INSTALL variable is deprecated and not used anymore.

All the relevant env variables are now prefixed with GKFS instead of
ADAFS

`adafs_preload_client` -> `gkfs_intercept`

`adafs_daemon` -> `gkfs_daemon`

get rid of adafs name from folder names

Glibc symlink

See merge request !8

lstat function was passing to the glibc a path without resolving it
first

We now use getaddrinfo syscall instead of parsing /etc/hosts in order to
resolve hostnames

A new cli parameter `--listen`,`-l` allow to specify binding address/interface

RPC port can now be configured at runtime through `--bind-port` command line argument.

For some comunication layers an out of band communication is required for putting in place the specific protocol handshake.

In those case a shared lookup file could be used to distribute deamon's endpoints information to all the clients.

This file need to resides on a shared filesystem and can be specified using the new CLI parameter `--lookup-file`.

When the pid file already exists don't try to kill the previously
running daemon. Just print an error and exit.

update margo to v0.4.3

See merge request zdvresearch_bsc/adafs!140

Implement access trough stat

See merge request zdvresearch_bsc/adafs!138

Do not override CFLAGS while compiling dependencies

See merge request zdvresearch_bsc/adafs!137