gtResetAnalysis : useful function to reset an analysis directory to the raw data, ready to be re-analyzed!

Signed-off-by: Laura Nervo <laura.nervo@esrf.fr>

git-svn-id: https://svn.code.sf.net/p/dct/code/trunk@698 4c865b51-4357-4376-afb4-474e03ccb993