speed up GRO/PDB file loading

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I don't think this is a big surprise if I say that loading a gro file in 
MDAnalysis can be painfully slow.
I think there is place for enhancement and that it will be a good idea to have 
a fast and reliable solution working for release 1.0.

Original issue reported on code.google.com by sebastie...@gmail.com on 5 Feb 2015 at 4:23

• Blocked on: #210

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Original comment by richardjgowers on 5 Feb 2015 at 4:31

• Now blocked on: #210

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I'm rejigging the topology readers into a class based structure for 0.9

Original comment by richardjgowers on 5 Feb 2015 at 4:32

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+1 for faster GRO (and PDB) readers (both as coordinates and topology readers). 
Probably cython would already provide a good compromise between ease of 
implementation and speed. 

This would be a very useful improvement for users (and also make interactive 
work much less painful).

Original comment by orbeckst on 5 Feb 2015 at 5:28

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Original comment by orbeckst on 5 Feb 2015 at 5:28

• Changed title: speed up GRO/PDB file loading

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Original comment by orbeckst on 10 Feb 2015 at 2:17

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