Context Navigation

Optimisation

v7	v8
22	22	* Avoid excess DB calls, Use web2py's {{{cache}}} instead
23	23	* Move as much JS to static files as possible
	24	* Investigate whether we should reduce the size of some of our fields (e.g. to fit query rows into the 4Kb pagesize)
24	25	* Investigate whether it is better to only T() strings once per request at the expense of additional global vars
25	26	* Investigate the possibility of loading large page components using AJAX (although this should only be for subsequent pages as there is a per-request overhead)