* pygnulib/GLConfig.py (setLibtool): New method, replaces enableLibtool
and disableLibtool.
(setCondDeps): New method, replaces enableCondDeps and disableCondDeps.
(setVCFiles): New method, replaces enableVCFiles and disableVCFiles.
(setSymbolic): New method, replaces enableSymbolic and disableSymbolic.
(setLSymbolic): New method, replaces enableLSymbolic and
disableLSymbolic.
(setLibtests): New method, replaces enableLibtests and disableLibtests.
(setSingleConfigure): New method, replaces enableSingleConfigure and
disableSingleConfigure.
(setDryRun): New method, replaces enableDryRun and disableDryRun.
(setErrors): New method, replaces enableErrors and disableErrors.
(__init__): Update.
* pygnulib/GLImport.py: Likewise.
* pygnulib/GLTestDir.py: Likewise.