Various nfstrace changes that have been sitting in my tree for awhile.

	* GNUmakefile.in: Do fs-install in the sensors subdir so the
	nfstracer gets installed.

	* sensors/and/and-emulab.priorities: Add some more daemon uid's to
	be excluded from auto-nicing.

	* sensors/and/and.c: Ignore invalid uids/gids in the config file
	instead of dying.

	* sensors/nfstrace/GNUmakefile: Makefile used to generate
	nfsdb-create.sql.

	* sensors/nfstrace/GNUmakefile.in: Some more installation stuff.

	* sensors/nfstrace/nfsdb-create.sql: SQL used to create the nfsdb
	database.

	* sensors/nfstrace/nfsdump2db: Bunch of bug fixes and cleanup.

	* sensors/nfstrace/nfsdump2db.8, sensors/nfstrace/nfstrace.7,
	sensors/nfstrace/nfstrace.proxy.8: Start at some man pages.

	* sensors/nfstrace/nfstrace.init.in: Try to detect the interface
	to listen on, not perfect though.  Add a restart handler that just
	restarts nfsdump2db.  Some other cleanup.

	* sensors/nfstrace/nfstrace.proxy: Some optimizations for
	resolving file name...