Revise and edit

Start with Christy's first draft, significant modifications to text and
layout...
add file from SPWLA with curve classes

web page at http://www.spwla.org/technical/curve-class has a text
formatted listing of log types and curve classes (observation types...);
this was copied and manipulated in text editor and this spreadsheet to
try and get it into a usable form. Its about 60% there. Seems like a
good exhaustive compilation of information people extract from wells...