Many things, most notable the lm78 module

* Some Makefile changes. doc/makefiles documents most of them.
* The lm78 module now compiles, but it will still crash.
* New module sensors, with general code usable by chip driver modules
* i2c-core: added function i2c_adapter_id(), which returns a (low)
  unique i2c-bus ID.
* lm78.h stuff moved into lm78.c or sensors.h


git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@19 7894878c-1315-0410-8ee3-d5d059ff63e0

i2c/detect/Module.mk

@@ -28,13 +28,15 @@ I2CDETECTSOURCES := $(MODULE_DIR)/detect.c
 # Include all dependency files
 INCLUDEFILES += $(I2CDETECTSOURCES:.c=.d)
 
-all :: $(I2CDETECTTARGETS)
+all-i2c-detect: $(I2CDETECTTARGETS)
+all :: all-i2c-detect
 
 # No install rule
 
-clean ::
+clean-i2c-detect:
 	$(RM) $(I2CDETECTSOURCES:.c=.d) $(I2CDETECTSOURCES:.c=.o) \
 	      $(I2CDETECTTARGETS)
+clean :: clean-i2c-detect
 
 # The targets
 $(MODULE_DIR)/detect: $(MODULE_DIR)/detect.o