$TRACE_CACHE_WRITES
data update
documentation for Strassen::Util
Array::Heap is enabled by default

$use_heap may be set to a false value to disable Array::Heap
operation, and may be set to a true value to emit a warning if
Array::Heap is unavailable.
various cgi configs: explicitly set $use_heap to 1

This is just to get warnings in case Array::Heap is not installed.
add Array::Heap to prerequisites and bundle files
Merge branch 'enable-use-heap'
data update