add -C/--ctx option to specify ctx file path[s] or pattern or dir multiple times in 'configure' and 'bootstrap' sub commands
introduce a global to define the default ctxs
do not use alias for loaded module
fix a PEP8 (E128) error
add notice about --ctx option
add
add utility function instead of simple globals
make options.ctxs set dynamicaly depending on options.site
make use of miniascape.globals.site_src_ctxs() instead of a global removed
load site default configs always by default