Stack-structured timing code
This commit adds stack-structured timing code, such that bits of SPINS can be instrumented with > timing_push("short name") > [... work goes here] > timing_pop() This is recursive, such that already-timed portions of the code can call the timing code to further instrument subroutines or discrete code segments, and the resulting structure follows the -dynamic- call stack. This does have the odd result that portions of the code that are re-used (namely spectral derivatives) can show up as several 'leaf' nodes in the graph. To print out the report to standard error, call > timing_stack_report() The exact format of the report should be considered tentative.
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