- locking of functions list during registration/unregistration/searching
 - rename of function description structure to be consistent with the rest of the API
 - addition of 'desc' element to description structure, for detailed description (like applications)
 - addition of 'show function' CLI command to show function details
 - conversion of existing functions to use uppercase names to match policy
 - creation of new 'pbx_functions.so' module to contain standard 'builtin' functions
 - removal of all builtin functions from pbx.c and apps and placement into new 'funcs' directory


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remove hardcoded CDR() support from pbx_builtin_setvar_helper in favor of already-implemented CDR() function
make SetVar() options actually work as documented
remove SetVar() 'c' and 'r' options, since the CDR() function can provide this functionality
add 'r' option to CDR() function to control recursive retrieval/storage
(inspired by bug #4143, but without the SetVar syntax changes)


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add GROUP_COUNT and GROU_MATCH_COUNT functions, deprecate GroupCount and GroupMatchCount apps, remove GROUPCOUNT variable from README.variables (bug #4133, with doc update)


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re-implement ast_separate_app_args with clearer code and in a way that doesn't fail with certain combinations of array size and delimiter count
add doxygen docs for ast_separate_app_args


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don't force register expiration when pruning realtime peers
provide feedback for successful single item prune operations


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use symbolic constants for RTP method flags, and add debugging output to sip_alloc to indicate when RTP is/is not allocated (bug #3986)


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testing has shown that ast_copy_string is nearly twice as fast as strncpy for the common use cases in Asterisk, so convert chan_sip over...


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change (iax2,sip) show (peers,users) to use 'like <pattern>' for pattern-matching to be consistent with other CLI commands


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add experimental ast_copy_string() function to be used in place of strncpy() (see discussion on asterisk-dev)


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