Reduce database size

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Species databases are particularly large for human, mouse and rat. To increase 
usability for systems with minimal hard-drive space, we can collapse 
junction/exon/reciprocal-junction annotation flat files into combined entries. 
To do this, we will need to combine unique IDs (e.g., exon/junction/junction 
pairs) into a single entry where the values are the same. This will eliminate 
the subfolders "exon" and "junction" for RNASeq and junction array databases 
and reduce database size by an estimated 20-40%.

Original issue reported on code.google.com by [email protected] on 21 Mar 2011 at 6:40