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Fix tab completion when you just do a plain tab without entering anything, and also fix show application tab completion. (issue #7089 reported by blitzrage)


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   So, I have removed all of the uses of AST_LIST_HEAD_INIT and replaced them
   with the equivalent static initializations.
 - On passing, fix a memory leak in the unload_module() function of chan_agent.
   The agents list mutex was never destroyed, and the elements in the agents
   list were not freed.


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this should fix bug #7142



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(use the walk_*() routines so we don't use the link fields
directly, and slightly restructure the blocks to reduce
the nesting depth).



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mark dubious code with XXX.



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E_MATCHMORE and '!'.
If the comments are correct, the code must be slightly changed
(simplified).



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As it turns out, all of these checks were useless, because alloca will never
return NULL.


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see the documentation near functions ext_cmp1() and ext_cmp().

All sorting decisions are now in one place so it is easy
to revise them.

NOTE
the major change is that now most specific patterns come first,
so there might be differences in how diaplans behave.
If you really really really need to revert to the old sorting order
while you adapt your dialplan, you can uncomment the '#if 0' line
in ext_cmp().



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prerequisite to implement the specification defined yesterday.

While I have been using this code for months now, the change is large
so expect some instability.

Also the new specification (sorting extension by match length etc.)
is not implemented yet.



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define struct pbx_find_info for later use



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 - remove some checks of the result of ast_mutex_lock, since it is not necessary
   (this would be a good project to add to the janitor projects list).


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 - we can't use ast_true here because non-empty strings would no longer be
   evaluated as true
document the return values of pbx_checkcondition() in doxygen format


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- add missing locking of the functions list in the "show functions" CLI command


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