In preparation for solving issue #19: providing cc_exec_dir as an alternative to cc_exec, which allows a parameter for the working directory, and debug output of current working directory in popen
Issue #19: rebasing from a CC_DIR with multiple and multi-level VOB symlinks underneath is now working by subsequent calls to lshistory, symlinks are cheked to be distinct (avoid cyclicity)
Issue #19 related: fixed also checking in symlinked files
added a sort of lightweight timing summary report for lengthy operations after performing them

Signed-off-by: Lucian Muresan <lucianm@users.sourceforge.net>
version 0.1.1, added HISTORY file