Bring TODO file back from the dead

TODO

+
+BUGS:
+
+ * tagged files are cleared if 'kill' fails
+   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=375219
+ * add swap column for swap usage in MB
+   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=365038
+
+FEATURES:
+
+ * expand/collapse on tree
+ * read SYSCONFDIR/htoprc (help, autoconf gurus!)
+ * handle saving of .htoprc more elegantly
+ * make bars display refresh independent from list refresh
+ * auto-calibrate delay 
+ * add some more 'top' features
+ * add more command-line parameters
+ * show 'process view'
+ * make keybindings configurable, blah blah blah...