Indexing / Performance improvements

[fxp]

Profiling indexing XSL shows that most of the time is spent on the "any" field indexing with recursive templates merging all tags content (see screenshot attached).

This patch suggests the following improvements:

• replace recursive allText template by a simple normalize-space(root) call which will merge all tags content + @codelistvalues
• use XSLv2 for lower-case function instead of custom translate function
• Bounding box
  • round coordinates to 2 decimals to speed up geographic numeric range search
  • do not try to index non numerics
• disable codelist indexing (which are not available in search)

XSL part of the indexing process is much faster. Indexing "Hydrological Basins in Africa" (XSL only) :

• Before : 40 to 60ms
• After : 9 to 12ms

Some more numbers to compare 2.4.3, 2.6 and trunk with this patch:  http://www.neogeo-online.net/blog/archives/482/

[fxp]

r6974