remove useless functions
invariant culture
basic refactoring
correcting the local machine install: the xll in the OPEN HKCU key should be the complete path to the .xll file.
use separated constants file (cannot use constant or static variables in custom actions class)
add more loging instruction in the custom action
Merge branch 'master' into additionalLogs
pass properties to custom actions (not constants)
remove check for the existence of xll. Could not manage to execute the custom action after the copy of xll's in INSTALLFOLDER