altered output message of config module

The presence/absence and location of the config file was printed
by the config module, which was aesthetically displeasing for the
other modules. The message is now clearer, so it is less
confusing for people running other modules.
added config path output to rebuild function

to ensure that calling rebuild_config would overwrite the same
config being accessed by import_paths, the path name is now
printed when rebuild_config is called.