WEB_SELECT_FLOAT Re-build index pages for selection of float pages.
INPUT:
Reads master spreadsheet (via GETDBASE) to get IDs of all floats
AUTHOR: Jeff Dunn CMAR/BoM Oct 2006
CALLED BY: nil - manually invoked
Note: This only needs to be used when:
a) a new float has been processed for the first time
b) the "status" of any float changes ("alive" to "dead" etc)
USAGE: web_select_float