New tools tdbRename and tdbSort for track hub builders

[Brian Lee]

For those hub developers who might be building large track groups we have added two tools caled tdbRename and tdbSort to sort and rename sections of large trackDb files.

tdbRename for mass-renames: https://genome-source.gi.ucsc.edu/gitlist/kent.git/raw/master/src/utils/tdbRename

tdbSort to sort a list of tracks by shortLabel: https://genome-source.gi.ucsc.edu/gitlist/kent.git/raw/master/src/utils/tdbSort