added new files
updated the text and introduced modifications to the structure. this is a partial commit. I am still working on changes to be shared later
additional touches to the introduction and framework sections 1 and 2, which are almost ready.
moved tables to independent files and added utilities file
general improvements and an almost complete velocity models section
created a figures directory and moved initial figures to a tmp subdir in there. next step is to create illustrator, gmt, and pdf subdirs in figures so i can manage figures in a more careful manner.
new dirs in the figures dir with gmt script to create map
general updates