Intermittent segfaults in casa-python method scansforfield on OSX 10.11

[pkgw]

Reported by Thoughtworks folks (CC @pandearti).

When calling msmetadata.scansforfield on OSX 10.11, it apparently segfaults intermittently.

System: OSX 10.11, Python 2.7, casa-nrao-casacore 4.5, casa-python 4.6.0, casa-tools 4.5.

[pkgw]

Once again, same question as in issue #3: your email said that you had switched to using the conda-forge and pkgw-forge sets of packages rather than the outdated pkgw packages. But the version information in this bug report seems to refer to the old versions. Can you please reply with the versions that you're testing now? The latest available ones should be something like casacore = 2.2.0_1, casa-tools = 4.7.2_1, and casa-python = 4.7.2_np112py27_4, where the piece after the underscore is the "build number" reported by the conda list command.

[pandearti]

Here are the new package versions (as displayed by conda list command)
Yes we still have same issue with these new packages.

casa-data r11000 0 pkgw-forge
casa-python 4.7.2 np112py27_3 pkgw-forge
casa-tools 4.7.2 1 pkgw-forge
casacore 2.2.0 0 conda-forge