Listen for all channel notifications

Based on [1], please find attached an implementation for listening

for notifications on all channels. The first two chunks lay some

groundwork and do not change the current LISTEN behavior, except

to improve performance of managing large numbers of channels.

v1-0001-Make-simplehash-more-flexible.patch makes working with

char pointer keys possible.

v1-0002-Improve-LISTEN-NOTIFY-UNLISTEN-performance.patch replaces

the current List implementation with a simplehash.h-based table.

v1-0003-WIP-Allow-LISTENing-for-all-channels.patch has the real meat

but needs further work, as the results from pg_listening_channels()

provides no clue that, after 'LISTEN *', the results list exceptions

rather than notifiable channels.

-- Trey

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