Merge pull request #28 from asfadmin/devel

Pull latest changes
Merge branch 'roipac' of https://github.com/rudigens/ASF_MapReady
Merge pull request #29 from rudigens/master

Pull latest changes
Merge pull request #30 from asfadmin/devel

Devel
Merge pull request #31 from rudigens/master

Pull latest changes
Merge branch 'roipac' of https://github.com/rudigens/ASF_MapReady
A few fixes around file existence checks.
Merge pull request #200 from rudigens/roipac

Roipac