CompileBL Scenario

The purpose of the scenario com.xaraya.core.jamaica.compilebl is to make 
it easier to add and remove custom tags. Currently the Blocklayout 
compiler takes into account tags by having them included through hard 
coded <xsl:include /> tags in the xsl stylesheet that transforms 
templates from source to compiled versions.

This scenario introduces a prior transformation, in which the 
<xsl:include /> tags are created dynamically. The transformation found 
at lib/blocklayout/xslt/booter.xsl adds any xsl tag found in 3 directories:

lib/blocklayout/xslt/defaults
lib/blocklayout/xslt/tags/bl
lib/blocklayout/xslt/tags/xaraya

[The latter 2 directories are new. In addition, the debug.xsl 
transformation has been moved to a new directory 
lib/blocklayout/xslt/debug to avoid it being loaded automatically.]

The thinking here is that in the future, when a module installs, any 
custom tags it has defined should be moved to 
lib/blocklayout/xslt/tags/xaraya. Of course, we still need to implement 
such a mechanism. At present this would need to be done manually. Any 
ideas as to where we should park say the <xar:articles /> tag in the 
odule's directory structure?