mapper compilation

~~remove~~ deprecate mapper.compile()
compile_mappers() becomes "configure_mappers()", old name is silly.
"configure_mappers()" no longer is a loop through mappers, calling each compile(), which is then a loop anyway, this is also silly, it moves into mapper.py and gains the body of mapper.compile().
~~remove most calls to mapper.compile().~~ Replace each mapper.compile() call with an inline check for "_new_mappers", then call to "configure_mappers()" if True. ~~at strategic locations within mapper.py, elsewhere, perhaps upon query() and in the usual get_properties() types of places.~~

5. the "compile_mappers" flag in get_property() should be removed, the check for "compiling" should be smart enough (thought it already was) to realize reentrant access and return. (why does the "_already_compiling" check return None?)

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