fixed FiieParser bug, testing for protein problem
Working on adding variation.

wormbase acedb converter now takes the first text node of each returned element when parsing a collection of nodes.  Before it textified whole node.
minor additions to wormbase acedb additions file, added support for allele.naturalVariant and gene.referenceAllele
processed mapping file outside of record processing loop, code more efficient
wormbaseacedbconverter can tell when tag exists, not yet fully implemented
custom source now accepts "if tag exists" boolean annotation.  In mapping file, prepend attribute name with "if." and loader will assert the value if the tag exists, regardless of its (lack of) children nodes
variation added, moving on to phenotypes
protein, variation tentative; phenotype ongoing