larrym: changes by commit

branch to review (2009-08-18 to 2009-08-25) v213

• avoid N^2 list scan in hasTrackDbAlready by using a loaded hash
  • src/hg/lib/hdb.c 1.410 - lines changed: 17, context: html, text, full: html, text
• use tableList table (if available) instead of show tables in sqlListTables
  • src/hg/lib/jksql.c 1.131 - lines changed: 25, context: html, text, full: html, text
• add Rectangle class support
  • src/hg/js/utils.js 1.24 - lines changed: 28, context: html, text, full: html, text
• add contextMenu support (currently dead code if jquery.contextmenu.js hasn't been loaded by hgTracks.c)
  • src/hg/js/hgTracks.js 1.35 - lines changed: 460, context: html, text, full: html, text
• move map manipulation code into contextMenu block
  • src/hg/js/hgTracks.js 1.36 - lines changed: 16, context: html, text, full: html, text
• support showTableCache config in sqlListTables
  • src/hg/lib/jksql.c 1.132 - lines changed: 6, context: html, text, full: html, text