Genreflex verbose by default, abbr. long options parsed correctly

o Verbosity enabled by default for the testing phase.
o More verbosity, e.g. rootmap[lib] filenames
o Long commandline options can be abbreviated up to 4 chars. For
example --myVeryLong-Option can become --myVe. Needed to restore
the good old python genreflex functionalities (leveraged by Gaudi
where --selection_file is --select)
o Cleanups here and there: maquillage