Major code cleanup.

- Make all internal functions "static".
- Make sure each module's header and implementation file match.
- Remove all library-like functionality from main.c, so only
  the actual frontend remains in main.c.
- Add C++ brackets to all header files.

That effectively leaves the various module C files as something like
an "avrdude library", with main.c being the currently only frontend
program for that library.  In theory, it should be possible to write
different frontends using the same library backend functions though.


git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@722 81a1dc3b-b13d-400b-aceb-764788c761c2

bitbang.h

@@ -22,6 +22,10 @@
 #ifndef bitbang_h
 #define bitbang_h
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 int bitbang_setpin(int fd, int pin, int value);
 int bitbang_getpin(int fd, int pin);
 int bitbang_highpulsepin(int fd, int pin);
@@ -43,4 +47,8 @@ int  bitbang_initialize     (PROGRAMMER * pgm, AVRPART * p);
 void bitbang_disable        (PROGRAMMER * pgm);
 void bitbang_enable         (PROGRAMMER * pgm);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif