Add outputPrecision parameter to configure precision of values.

[snummelin]

Add -outputPrecision parameter to cbc so that user can change precision: %.nf → n digits after decimal; %.ng → n significant digits. Default value is %15.8g.

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[jjhforrest]

Modified to try and make it more like other string parameters.
Main change is that I have renamed it as precision - full name precisionOutput as output(Format) was already in use and would become ambiguous if output(Precision) was used.

[svigerske]

@jjhforrest changes are in c9a14f0 on master, and the following commit fixes that it didn't compile.

[jjhforrest]

I am an idiot. Put in tiny change at end before commit.