Since the download of sources are performed in parallel, we cannot use
anymore a single log file.

The output of the download commands has been reduced to errrors only and
it will be outputted directly on stderr. Thus the log file stuff have been
completely removed.

Moreover the clonedeps function now takes the REPO as second parameter
and additional (non mandatory) git flags as fourth parameter.

Additional fixes have been introduced to run commands in script mode
(-q, -f, ...)

For dependencies in which a specific tags is specified we can download
the code snapshot instead of cloning the whole repo.

Perform all the download and git clone action in parallel using several
processes.

Due to the new parallel use of the clonedeps and wgetdeps functions,
some adjustment to printed message has been made. Now the function write
on stdout only once when they complete.

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

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

Recompile mercury for local I/O to work

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

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

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.