some more flags I used to check code quality.

Signed-off-by: Kristof Szabados <Kristof.Szabados@ericsson.com>

Makefile.cfg

@@ -122,6 +122,8 @@ COMPILERFLAGS := -Wall
 # 'Hardcore' settings
 # Unlikely to work for GCC below 4.x
 #COMPILERFLAGS += -Werror -pedantic -W -Wno-unused-parameter -O1
+#COMPILERFLAGS += -Wpedantic -Wextra -Wconversion -Wfloat-conversion -Wsign-conversion -Wint-conversion
+#COMPILERFLAGS += -Wfloat-equal -Wcast-qual -Wparentheses -Wlogical-op
 
 # Flags for the C compiler.
 # std=gnu9x shuts up warnings about long long and variadic macros