v 0.2.4 (2016_01_15) : --mirroronly, logfiles are now sliced if too large
o new option : -si/--sourceinfos
o fixed the way log files are backuped when too large :
added a constant in the configuration files : [log file]maximal size
log files are now opened with the "a" mode by the logfile_opening() function
o added the LOGFILE_SIZE constant
o added the LOGFILE_DTIMEFORMATSTR constant, used by the backup_logfile() function
o added a function by refactoring the code : backup_logfile()
o refactoring the code : added function get_logfile_fullname()
o fixed create_faked_target.sh and took in account the --configfile option
o in main_warmup(), 'path' > 'cfg_path'
o in logfile_opening(), 'fullname' > 'logfile_fullname'
o improved the documentation in README.md
o improved messages in various functions
o updated pylintrc (max-branches=17)
o 6 tests, pylint=10.0 for the three Python scripts
o version packaged and sent to Pypi (https://pypi.python.org/pypi/Katal)
