Fixes a minor issue with the 'export' command failing to copy the BASE revision of files when '-rBASE' is specified. Also fixes translation of keywords for locally modified files, as well as adding appropriate timestamping. Adds a couple of tests for this new functionality. * subversion/libsvn_client/export.c (copy_versioned_files): Added revision parameter. Changed the copy algorithm to translate keywords and eol style when appropriate. (svn_client_export): Added the ability to better distinguish when the repository should be contacted versus using the local base or working copy. * subversion/clients/cmdline/main.c (svn_cl__cmd_table): Updated to reflect export's new functionality. * subversion/tests/clients/cmdline/export_tests.py (export_working_copy_with_keyword_translation, export_working_copy_with_property_mods, export_working_copy_at_base_revision): New export tests. * subversion/tests/clients/cmdline/svntest/actions.py (run_and_verify_export): Added new *args parameter to support new export tests.