Storing of full INFO in variants table

The OrderedDict object created by the VCF parser is pickled and stored
as a blob in the variants table, much the same as the genotypes bumpy
arrays
Minor change
Reverted to storing Info as pickled OrdredDict object

INFO string from VCF file is retained as parsed OrderedDict.
Clean up and removal of variables no longer needed
Tweak to flatten arrays inside var.INFO OrderedDict
store_false instead of store_true for load-info-string
Merge pull request #246 from dgaston/master

Added storage of var.INFO OrderedDict in GEMINI DB