add .lldbinit improve debug comment in Makefile.local

.lldbinit

@@ -0,0 +1,18 @@
+#
+# lldb calc
+#
+# IMPORTANT: Under macOS, use this local ./lldbinit file, your home directory file:
+#
+#	~/.lldbinit
+#
+# must contain this line (w/o the leading # and whitespace):
+#
+#	settings set target.load-cwd-lldbinit true
+#
+# To debug calc with lldb from this directory, just run:
+#
+#	lldb
+#
+target create "./calc"
+process launch -tty --environment CALCPATH=./cal --environment LD_LIBRARY_PATH=. --environment DYLD_LIBRARY_PATH=. --environment CALCHELP=./help --environment CALCCUSTOMHELP=./custom -- -q -d
+b main

Makefile.local

@@ -98,7 +98,7 @@
 #
 # Uncomment these lines:
 #
-# DEBUG:= -O0 -g
+# DEBUG:= -O0 -g3
 # FSANITIZE:= -fsanitize=undefined -fsanitize=address -fsanitize=bool -fsanitize=bounds
 # FSANITIZE+= -fsanitize=enum -fsanitize=vptr -fsanitize=integer-divide-by-zero
 # FSANITIZE+= -fsanitize=float-divide-by-zero -fsanitize=float-cast-overflow