add a feature to the facade adjustments to save and retrieve the variables (into and from a text file).
move sandbox path to the general Logger file as it is used for more than one of the project classes.
forbid spaces in formula and improve the checker by forbid also the '^' (python uses'**').
clean info logs that where debug.

git-svn-id: svn+ssh://controls01/siciliarep/svn/trunk/tango_client/ctrflyrtech_fdl/trunk@13272 a18efa20-c439-0410-bf20-9b91ec695b4c