@falkamelung noted a race condition in #106 due to non-atomic directory
checking followed by os.makedirs. This pattern exists in many places
in the codebase so I went ahead and replaced the rest of them.
The new exist_ok usage should be terser and more idiomatic.
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()
Ryan Burns
Zhang Yunjun
Eric Gurrola