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Usage of timer:send_interval can lead a very large number of timers being created in controller_comet.
When this hapens the timer server will become a bottleneck. Use erlang:send_after is much cheaper for dynamically generated timers.
During changing the code I also spotted a subtle bug which can lead to missed updates when multiple scripts are pushed to the page within 50 ms. Resetting the timer will cause the comet process to crash.
mod_base: use erlang:send_after instead of timer for dynamic processe…
…s. Fixes #538