Accept variable length note names

Read up to the first blank in note_read() instead of assuming a
fixed-width note file name. Accept everything up to 40 characters (which
is the length of a SHA1 hash in hexadecimal representation).

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

src/calcurse.h

@@ -109,7 +109,8 @@
 #define ATTR_HIGHEST  6
 
 #define STATUSHEIGHT  2
-#define NOTESIZ       6
+#define MAX_NOTESIZ   40
+#define TMPEXTSIZ     6
 
 /* Format for appointment hours is: HH:MM */
 #define HRMIN_SIZE 6