- fixed startup.m file in main seizmo directory
  - added -all flag to javaclasspath call so
    jars in the static classpath are also checked
  - added checking on the existence of directories
    for optional components before attempting to
    add them to the path
  - reordered m_map & m_map_fixes so the fixes
    are used instead
  - made into a function so the workspace is not
    cluttered with variables at startup