Fixed a dozen typos. Completed the insert statement

RaspberryPi/configreader.h

@@ -18,7 +18,7 @@ int cfgreadpinamount(void);
 int cfgreadsensornodes(sensornode *nodes, int nodecount);
 int cfgreadcompareidamount(void); //currently unused but will be necessary if there'll be any node filters
 int cfgreadcompareidvalue(int element); //same
-char *cfgreadDatabaseUser(void);
+const char *cfgreadDatabaseUser(void);
 int cfgreadNodeRefreshRate(void);
 
 #endif