support more implied or mandatory options
support GtEncseq for region mappings
give proper error message when input sequence is empty
use GtEncseq as GtBioseq backend
add .tags* files to .gitignore
return error message on invalid table ID
add include to header
add SNV feature type
cosmetics
add SNP annotation streams/visitors
add `gt snpper' tool
intermediate: debug stuff for regionmapping
extend GtSeqCol to deliver descriptions for multiple files
intermediate (with debug)