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Possible speedup for requesting sie file #1555 (#1570)

* Possible speedup for requesting sie file #1555

When creating the sie file there is a marker string that Trick searches
for where it writes the run time allocated memory.  The loop that was
searching for the string was iterating one character at a time and reading
from file each time.  This was slow.  Changed the loop to read 1Mb into
memory at a time and search for the string.  Handled the case where the
marker string could straddle the 1Mb boundary by copying a small portion
of the previous part of the file for the next search.  For my one test
point sie file generation dropped from 90+ seconds to 3.5 seconds.

* Possible speedup for requesting sie file #1555

Math was wrong on some offset values.  Fixed them now.

* Possible speedup for requesting sie file #1555

The mac won't allow me to declare a "char buff[1000001];".  It compiles
but throws an exception when run.  Changed it to "char *buff = new char[1000001];"

20 of 20 new or added lines in 1 file covered. (100.0%)

13554 of 21838 relevant lines covered (62.07%)

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