Update QueryResult to handle alternative hit IDs
Add alternative ID querying to tabular BLAST results
Add alternative ID querying to XML BLAST results
Use ' >' instead of '>' for resilient blast-xml alt ID parsing
Also use sallseqid column as a fallback in blast-tab parsing
Rename alternative ID and desc attributes for consistency
Expose 'id_all' and 'description_all' instead of their 'alt' counterparts in SearchIO
Update NEWS
Merge pull request #307 from bow/patch_multiple-hit-ids

Add alternative ID support to SearchIO