* Moved package info reading procedures to a packageparser module. This is to prevent recu
rsive dependencies between nimscriptsupport and packageinfo modules.
* Passed the Options object to all procedures which read package info (necessary for nimscriptsupport module, to find the path of the nimscriptapi module)
* Introduced an ``isInstalled`` field to the ``PackageInfo`` type. This is a bug fix for g
etRealDir: it no longer uses the ``src`` field in the path it returns for installed packag
es' PackageInfo objects.
* Improved error reporting from NimScript evaluator.
* Renamed compiler/options import to ``compiler_options`` in ``nimscriptsupport`` module.
* Backward compatibility for .babel packages in getNameVersion proc.
* Introduced a getInstalledPkgsMin procedure which does not read package info, but only pr
ovides minimal info instead.
