Last batch of 'static' qualifiers for module-level global variables.

Fix up modules in the 'apps' directory, and also correct the bad example of
enum definitions in include/asterisk/app.h, which many developers followed
(thanks for reading the documentation!). In addition, add some basic usage
examples of the 'pahole' and 'pglobal' tools to the coding guidelines.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@200656 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_read.c

@@ -108,11 +108,11 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 	</application>
  ***/
 
-enum {
+enum read_option_flags {
 	OPT_SKIP = (1 << 0),
 	OPT_INDICATION = (1 << 1),
 	OPT_NOANSWER = (1 << 2),
-} read_option_flags;
+};
 
 AST_APP_OPTIONS(read_app_options, {
 	AST_APP_OPTION('s', OPT_SKIP),