workaround for compiling on systems that do not define LLONG_MAX by default
added a workaround for external data indexing issues (by completely disabling that functionality)
do not mark memory segment as valid until the initialization is completed
added a note to the manual about the external data/index interaction
improved handling of large (>2G) memory segments
added an option to "rescue" dump database contents
code cleanup: removed DOS CRLF from some source and header files