ADA-FS's statfs will fill the struct mostly with rough estimations.
It is not supposed to return accurate data but "some" data for applications to work

The specific version is necessary for local I/O to work.

Added lseek64 syscall and used file flags properly

Marc Vef authored Feb 23, 2018 and Marc Vef committed Mar 02, 2018

Recompile mercury for local I/O to work

Users may use -DCMAKE_CXX_FLAGS_DEBUG to add addition compiler flags for debug mode.

-g -O2 has been replaced with -O3 in all cases.

The file position of a newly created OpenFile
it wasn't set correctly to 0.

See https://xgitlab.cels.anl.gov/sds/margo/issues/40 for reference of the issue.

Through boost::program_option it is possible to specify which are
the mandatory parameter and to print a proper error message in case some
of them is missing.

5.10.2 -> 5.10.3

5.10.2 couldn't be compiled with gcc 7 due to a rocksDB bug [1]

[1]: https://github.com/facebook/rocksdb/issues/3486

The download script can be used to update dependencies source code by
pull the new version and performing a checkout to that version.
Without forcing (-f) the checkout files that have been modified or
patched won't be updated correctly.

Do not force a specific c(++) compiler by setting the
CMAKE_{}_COMPILER variable.
After the c(++) compiler binary has been choosen check if it is the GNU compilear.

In this way we allow the users to specify a GNU compiler under a non
standard path through the CC and CXX envirnoment variable.