Provide the pkgroot value in ghc-pkg dump & describe when necessary
Tools handling installed packages need to be able to interpret the paths which are relative to the ${pkgroot} which means they need to know the value of ${pkgroot}. With ghc-pkg this is not always obvious since ghc-pkg does not currently have any way machine interface for reporting the location of its package dbs (global, user). The solution we have arrived at is simply to emit the pkgroot as an extra field when it is needed. There are two cases: * --no-expand-pkgroot: ghc-pkg dump/describe will not expand the ${pkgroot} var, so it will appear literally in the output and the pkgroot field will be generated so that tools know what value to use for the ${pkgroot}. * --expand-pkgroot: ghc-pkg dump/describe will expand the ${pkgroot} and ${pkgrooturl} vars and will not generate the pkgroot field. The defaults are: * ghc-pkg dump/describe --no-expand-pkgroot * ghc-pkg field --expand-pkgroot
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