New 4UTILS and SYSUTILS

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#1
I overhauled @XREPLACE[] (needs testing).

All three parameters are subject to TCC escape sequences (^r, ^n, ...) being expanded.

[Replacement] can use back-references \0 ... \31 ( or \{0} ... \{31} ) as well as a few perl-like escape sequences (\\, \t, \n = CRLF)

Also in 4UTILS are line counting functions @LC[file] and LC. They're very fast. Both give the actual number of lines and you can pipe to LC.

I changed @CLOCK[] so that clock 0 (no longer clock 5) is the pseudo-clock for the session's duration.

New to SYSUTILS are _PERFCOUNT, _PERFFREQ, _RDTSC.

New 32-bit ones on lucky.syr.edu and barnyard.syr.edu.