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).
Renamed www/ back to web/
web/: Moved auxiliary files into the main/ subdir in preparation for having just the web/ dir. Renamed web/ to www/ so it can be replaced with web/main/.
web/main/util.php: Added coalesce()
web/vegpath/: Renamed to web/main/ because the content here is the main site hosted on vegbiendev. It will eventually contain internal links to VegBIEN resources in addition to external links (persistent URLs) to sources used in creating VegBIEN.
web/vegpath/util.php: Added ensure_prefix(), ensure_suffix()
web/: Removed svn:executable permissions from non-executable files
web/vegpath/util.php: Added array_non_empty(), join_non_empty()
web/vegpath/util.php: Path: Made $tail default to ""
web/vegpath/util.php: partition(): Fixed bug where strpos() actually does take the search-for param second rather than first (but returns false on no match)
web/vegpath/util.php: partition(): Fixed bug where strpos() returns false rather than -1 on no match
web/vegpath/util.php: partition(): Fixed bug where strpos() takes the search-for param first rather than second
VegRef/: Renamed to VegPath to make it clearer that the purpose of the web service is to provide short, globally unique paths to resources (e.g. for use as global IDs <https://projects.nceas.ucsb.edu/nceas/projects/bien/wiki/Global_IDs>)
Added web/VegRef/, which provides a URL-shortening service for vegetation references. VegRef URLs are short and human-readable enough to be used as database column names. This also causes Google spreadsheets to display a clickable link for each column name, which takes the user to the data dictionary definition for the term. String row IDs (such as global IDs <https://projects.nceas.ucsb.edu/nceas/projects/bien/wiki/Global_IDs>) can also be clickable VegRef URLs.
