Stack:
+ add alks and rlks while writing config file for unwrap
unwrap:
+ calculate the az/rg spacing/resolution and the equivalent number of independent looks in extractInfoFromPickle()
+ uncomment corrlooks setting in runUnwrap()
expose the -f / --filter_strength option in the parser to user so that one is able to change the filtering strength. Default is setted as the hardwired value - 0.8, so previous setting won't be affected.