Installation script corrections on OS X 10.8.5 and MacPorts

Added '-n' flag to avoid triggering rebuild of other obsolete/broken ports.
Added '-v' flag to shell script.
Added a "cd" to basemap directory.
Sourced ~/.bash_profile.
NOTE: this appends to .bash_profile so one could end up with multiple sources of the "profile.mac" extra commands.  Harmless but noted.