+20130525
+ + modify mvcur() to distinguish between internal use by the ncurses
+ library, and external callers, preventing it from reading the content
+ of the screen which is only nonblank when curses calls have updated
+ it. This makes test/dots_mvcur.c avoid painting colored cells in
+ the left margin of the display.
+ + minor fix to test/dots_mvcur.c
+ + move configured symbols USE_DATABASE and USE_TERMCAP to term.h as
+ NCURSES_USE_DATABASE and NCURSES_USE_TERMCAP to allow consistent
+ use of these symbols in term_entry.h
+