Add methods for identifying and linking genetic variants and other genetic changes

[gaurav]

These often show up in a particular format. I'm not sure where to find identifiers for them, but we should look and see what we can find. Some examples:

• Arginine84 to Glutamine substitution
• Mutations at codon 272 and 273
• deletions in the major deletion-rich region of the DMD gene
• 6q24-25
• 137-bp insertion
• NDUFS2
• Chromosome 1
• NDUFS3
• Chromosome 11
• NDUFS6
• Chromosomes 5 and 6
• NDUFS2 and NDUFS3
• Pro75 Ala
• D90A-SOD1
• GJB2 variants
• GJB2
• Deafness-associated variants of GJB2
• Mutant allele with an A to C substitution at nucleotide 879 in exon 9
• Amino acid substitution N495K
• L501I substitution
• Arg 1306 Trp (R1306W) substitution
• IVS8 -2A>G
• 2238-9del AG
• G6410T
• 22q11 chromosomal band
• TRPV6(D542A)