Hughes lab server missing data files, chokes IGB

Some of the Hughes lab genomes on their QL site don't have the required files, e.g.,

[java] WARNING: URL http://hugheslab.ccbr.utoronto.ca/igb/M_smegmatis_mc2-155_March_2008/mod_chromInfo.txt is not reachable, and is not cached!
[java] Apr 14, 2011 6:33:33 PM com.affymetrix.genometryImpl.quickload.QuickLoadServerModel getInputStream
[java] FINE: Load URL: http://hugheslab.ccbr.utoronto.ca/igb/M_smegmatis_mc2-155_March_2008/mod_chromInfo.txt

IGB should alert the user when a QL site can't be used because it is missing critical files.

Currently, it gives no warning - it just shows nothing when the site's contents.txt file is missing.

IGB should instead open a dialog that says:

"Warning: QuickLoad Data Source [NAME] does not contain required contents.txt file for requested genome version [GENOME VERSION]."

where NAME is the name being shown in the Data Sources and Data Sets table.