moved everything into /trunk/ to create the standard svn layout, for use with tools that require this (eg. git-svn). IMPORTANT: do NOT do an `svn up`. instead, re-use your working copy's existing files with `svn switch` (http://svnbook.red-bean.com/en/1.6/svn.ref.svn.c.switch.html).

Always output Usage messages to stderr and word-wrap them using `fold -s`

Made row #s 1-based to the user to match up with the staging table row #s

row: Support getting multiple rows. Document that does not handle embedded newlines.

row: Don't prepend header row because this feature prevents the program from being used on a pipeline. Sheets may be constructed in a pipeline if multiple segments need to be joined, e.g. with cat_csv.

Added row to get a row of a spreadsheet, preceded by the header row