Issue 89 in partcl: Implement srand() and rand()

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Comment #3 on issue 89 by wcoleda: Implement srand() and rand()
http://code.google.com/p/partcl/issues/detail?id=89

http://www.tcl.tk/man/tcl8.5/TclCmd/mathfunc.htm describes these functions.

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Comment #4 on issue 89 by wcoleda: Implement srand() and rand()
http://code.google.com/p/partcl/issues/detail?id=89

Here's some output from an 8.5 tclsh:

$ tclsh8.5
% expr rand()
0.5210889827092593
% expr srand()
too few arguments for math function "srand"
% expr srand(3.2)
expected integer but got "3.2"
% expr srand("whee")
expected integer but got "whee"
% expr rand(1,2,3)
too many arguments for math function "rand"
% expr srand(1,2)
too many arguments for math function "srand"
% expr srand(1)
7.826369259425611e-6

to convert an arbitrary argument to an integer, use the 'toInteger' helper
sub. It
should throw the appropriate error if given an invalid value. tests for
expr are in
t/cmd_expr.t (and are written in Tcl)

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Comment #5 on issue 89 by wcoleda: Implement srand() and rand()
http://code.google.com/p/partcl/issues/detail?id=89

(Right now the too few/too many errors are handled via the pge/ast/pir
transform, so
you don't need to handle that in the .sub definition itself.)