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Support parallactic angles computed by astropy as well as faster casa measures parallactic angle computation #195

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sjperkins
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Using the pyrap.measures python interface is too slow.

Based on Bruce Merry's katsdpimager code.
But this breaks agreements with MeqTrees...
- Broadcast time and antenna positions against each other.
Apparently this happens anyway when going to AltAz.
This reverts commit 0c0849c.

This makes things much slower, almost 10x. This is likely because the
scalar pole and field centre are broadcast against all antenna
positions and times.
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Can one of the admins verify this patch?

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